This addon might be a little broken but maybe with a bit of hard work it can get improved
This isn't officially "version 9" but since I added a couple of new things then this is like a new version
Also, there isn't a "bfg20kv9", I added the "FIXED" to let admins know this a (mostly) stable version, so they don't ban it instantly
Please let me know in the legendary discord about anything related to this fix.
All changes below made by RickyV

bfg20k version 9 FIX changelog: 

++Fixed (finally) the exploit that could lag and even crash servers
+Added the alt-fire for the planet cracker to the original ion blast from russian overkill
+Added the Gurumaster's death ball to the Legendary Fusion Cannon
+Added new effects to the Nuclear BFG primary and secundary projectiles
+Added new effects to the Portable Nuclear Trap bomb
+Added new sounds to the Legendary Fusion Cannon
+Buffed the Enraged Karasawa to shoot a little faster
+Buffed the Enraged Behemoth Cannon to Shoot a little faster
+Buffed the enraged rune, now it gives you extra damage/resistance to legendary weapons/enemies 
+Buffed the BFG 3500 explosion pulse
+Buffed the Death ball from the Legendary Fusion Cannon to shoot legendary projectile while flying
*Changed most of the pick up texts for weapons items to be more readable 
*Changed some obituaries to be more readable
*Changed the "Real True Legendary BFG" To the "Legendary Fusion Cannon"
*Changed the "bfg20k" to "the Nuclear BFG"
*Changed the "demon tech nailgun" to the "Dual Super-Charged Rifle"
*Changed the Legendary/enraged Karasawa projectile zig-zag to go straight
*Changed the "Legendary super chaingun" to the "Legendary minigun" and the "enraged super chaingun" to "the The Dual Enraged Minigun"
*Changed the "Plasmatic Assault Shotgun" to the "Rapid Fire Plasma Shotgun"
*Changed the "enraged thermonuclear bfg20k bomb" to the "Portable Nuclear Trap bomb"
*Changed the Portable Nuclear Trap bomb to explode instead of shooting a bfg20k ball
*Changed all the weapons being on SLOT 0, now they are in their respective slots
*Fixed the monsters dropping normal skulltag runes instead of the inventory runes
*Fixed Monsters not droping the Life/super rune and only dropping the leg rune
*Fixed the enraged rune not working
*Fixed legendary weapons doing dmg to enemies immune or resistant to legendary weapons
*Fixed some weapons having no damage factor values
*Fixed Dual Super-Charged Rifle having green and red effects while flying and on impact
*Fixed the enraged minigun doing WAY more damage that it should, also it now shoots 2 bullets instead of 1
*Fixed all the mines having the incorrect damage factor values
*Fixed little bugs here and there
-nerfed The Rapid Fire Plasma Shotgun damage to 5
-Nerfed Super-charged rifle now uses 5 ammo instead of 1, increased magazine from 80 to 100
-Nerfed Super-charged bfg9000 now uses 60 ammo instead of 5(lol), added extra effects
-Nerfed Super-charged DTBFG10K Now uses 125 ammo instead of 100, on impact it shoots a tracer every 1 degree, for a total of 360, 20 dmg each
-Nerfed true leg railgun now uses 10 ammo per shot instead of 5
-Nerfed the Nuclear BFG's Singularity ball damage and it can't no longer bounce
-Nerfed the drops for the heresiarch and the abysal satyr, now they don't drop 5 billion items
-Nerfed the BFG 3500 one-shotting everything
-Removed the leg devastator alt-fire
-Removed code in decorate/keyconf containing removed weapons


/////BFG20K version 10 FIX changelog\\\\\ 
*Fixed bugs on some monsters
*Fixed missing sprites for the BFG3500 
*changed the location of all the code files to the "decorate" folder instead of the "actors"
+Added new items to the Legendary Doomguy also they spread a little so they aren't all in one spot
-Removed spawner and alt spawner since they don't work
-Removed unused files to free up space

/////BFG20K version 11 FIX changelog\\\\\

*Fixed the KEYCONF having the wrong player class
*Fixed players having self-damage on weapons that shouldn't do self-damage
*Fixed trueleg sentient not spawning
*fixed trueleg Zombie not spawning
*fixed the legendary minigun and the enraged minigun having self-damage

/////BFG20K version 12 FIX changelog\\\\\  This version made by Titatium
+Added new weapon Vexed Nemesis Rifle, it will be drop from Vexed Zombie and Vexed Imp
+Added new weapon Legendary Quad Shotgun, it will be drop some legendary enemies and true legenadries
+Added new weapon Old Unmaker, because i changed new one on my addon (XtraWeapons 3.0 / TXS 1.0)
+Added new ammo Vexed Nemesis Demon Ammo
+Added new code Vexed Morestuffs for Vexed Zombie and Vexed Imp with Vexed ammo and chance for Super Nemesis Sphere and Old Unmaker
+Adeed new sprites to Enraged Behemoth Cannon
+Added decorate keys to rest of weapons
+Added file CREDITS shows who was made
+Added file SBARINFO
+Added one sound to The Dual Enraged Minigun for EmptySpinDown
*Changed new projectile to True Legendary BFG 15K
*Changed arranged sounds files
*Changed obituary to The Dual Enraged Minigun offended to killer
*Fixed one sound to Enraged Behemoth Cannon
*Fixed Legendary Minigun and The Dual Enraged Minigun sprites with perfect offsets
*Fixed True Legendary Zombie and True Legendary Sentient no lights
-Removed all NOGRAVITY flags to skulltag runes

/////BFG20K version 13 FIX changelog\\\\\ This version made by rickyV
*Fixed the Legendary Devastator's ball Shooting the wrong projectiles
*Fixed the Legendary Devastator's effects being affected by time freeze
*Fixed the Legendary Doomguy Not dropping the life rune
*Fixed the Nuclear BFG's obituary
+Added new weapon the Rapid Fire Plasma Shotgun
-Removed some SBARINFO weapons that don't exist
*Fixed Planet Cracker typo on SBARINFO
*Fixed the Nuclear BFG's green ball missing trail
*Fixed the Ammo Sphere giving ammo that doesn't exist
*Changed the Ammo sphere to regenerate all ammo
*Fixed the backpacks not having enraged legendary bullets
-Nerfed the ammo sphere duration to 1 minute from 15 minutes
+Added the Enraged Legendary Rune to the HUD
+Added the Legendary health and armor bonuses (rare!)
+Added the hellfire health bonus (Very rare!)
+Added the Enraged Legendary health and armor bonuses (really rare!)
+Added the Nemesis health and armor bonuses (Extremely rare!!)
+Added the Swiborg Health And Armor Bonuses (ULTRA RARE!!!)
*Changed the Spread killer to drop a spread rune when used, added new messages too

/////BFG20K version 14 FIX changelog\\\\\
++Fixed major bug that caused the HellFire Armor to crash the game
*Fixed upgraded terminator sphere not appearing in the HUD

/////Complex-BFG20K_V0.15 Changelog\\\\\
+Merged spritefix patch into BFG20K and all included fixes
*Changed the lumps to be in their own folders
+Added all the new weapons to the random spawners, now they can randomly spawn on the map
+Added obituary to nuclear BFG
+Added all the mega spheres/ultra spheres to the megasphere spawner
*Fixed missing ammo on exp shotgun and leg bfg's
*Fixed weapons being first on their category, now they are in order
*Fixed the supercharged bfg10k crashing the game
*fixed the Legendary Devastator Shooting rail attacks at players

/////Complex-BFG20K_V0.16 Changelog\\\\\ 
*Fixed tech erasus not spawning in the plasmagun spawner
+Added phase rifle to plasmagun spawner 
*Fixed Freeze BFG not spawning in the BFG9000 spawner
*Fixed planet cracket not being selectable
*Fixed DT-BFG10K not being selectable
*Fixed missing ammo counter on some weapons
*Fixed missing effect on swiborg bonuses
*Fixed missing effect on SC BFG9000
*Fixed missing BackPacks on player spawn
-Removed duplicated code from hemitems
+Added effects to some items
-Removed unused alpha sprites
*Fixed Planet Cracker's altfire using no ammo

/////Complex-BFG20K_V0.17 Changelog\\\\\ 
*Fixed Explosive Shotgun HUD sprite(FINALLY)
*Changed the health/armor bonuses to be rarer
*Changed the mega/ultra spheres to be rarer
*Fixed typo on HellStormBFG obituary
+Buffed HellStormBFG primary fire to shoot straight
+Added secundary fire to HellStormBFG

/////Complex-BFG20K_V0.18 Changelog\\\\\ 
-Removed irrevelant fixed sprites
*Fixed pulse shotgun and Rapid Fire Plasma Shotgun doing self dmg
*Fixed Legendary Fusion Cannon Doing damage to team mates
*Fixed Legendary Fusion Cannon Causing lag
*Fixed armor shard not spawning

/////Complex-BFG20K_V0.19 Changelog\\\\\ 
*Fixed planet cracker Ion Blast causing a crash
*Fixed planet cracker Ion Blast doing self damage
*Changed the Planet Cracker Ion Beams Effect
*Fixed Strength rune sprite looking like a torch
+Added new items to the berserk spawner
+Added Inventory runes to the berserk spawner(very rare drop)
*Changed the OldUnmaker to the Skin Laser, new alt-fire too

/////Complex-BFG20K_V0.20 Changelog\\\\\ 
+Added the "True Legendary Pulverizer"
-Nerfed the "Plasmatic Assault Shotgun"
+Buffed the "BFG 3500"
+Buffed "The Nuclear BFG"
+Buffed the "SuperCharged BFG9500"
+Buffed the "SuperCharged Demon Tech Rifle"
+Buffed the "Vexed Nemesis Rifle"
+Buffed the "enraged Legendary rune", gives more regeneration
-Nerfed the "Abyssal Satyr" and "Heresiarch" drop chances
*Fixed some typos in abituaries
+Added "enraged Legendary rune" to the "Enraged Legendary Imp" drops
*Changed "PlanetCracker" ammo type to "TrueLegendarycell" 
*removed "PlanetCracker" from Corrupted Cardinal drops
+Added "PlanetCracker" to the True Legendary Sentient drops
+Added new drop for the True Legendary Cardinal
*Fixed Acid Worm not going through players

/////Complex-BFG20K_V0.21 Changelog\\\\\ 
*Fixed Nuclear BFG doing no dmg + added effects

/////Complex-BFG20K_V0.22 Changelog\\\\\ 
+Fixed legendary runes drop rates, legendary rune now has the highest drop chance, then life, then super, then a shuffle sphere
*Fixed super charged rifle reloading at full ammo
*Fixed super charged rifle doing self damage
*Fixed dual super charged rifle doing self damage
-Nerfed super charged rifle and dual super charged rifle to 50 dmg from 80
+Enraged legendary Rune now drops on death like the rest of the runes
+Added a couple of drops to Exos
+Added extra drops to nemesis enemies
+Added true leg cells and vexed ammo to the backpacks

/////Complex-ClusterWeaponsV1.0 Changelog\\\\\
*Fixed black rune pushing other players
-Removed the effects from the "Legendary Fusion Cannon" to reduce lag
-Removed effect on the dark matter for causing massive lag when spammed
+Added the Terminator, the black rune and the nemesis mega sphere to drop on death
*spread rune now can't be picked if the player activated it
-Removed Legendary/Enraged mines/items
-Removed "Nuclear BFG(BFG20K)"
-Removed "Legendary Quad Shotgun"
-Removed Redundant copy-pasted code from most monsters
++Since The BFG20K got removed, the name of this wad is redundant
++Officially changing the name to "Complex-ClusterWeaponsV1.0.pk3"

/////Complex-ClusterWeaponsV1.1 Changelog\\\\\
++Fixed SBARINFO causing a crash
+Added "Undroppable" flags too all of the weapons
*Fixed armor bonuses not working, buffed the enraged, nemesis and swiborg armor ammount, +made them a bit rarer 
+Added new ammo type "LegendaryFusionCell", dropped by true legendaries
+Added the new "LegendaryFusionCell" ammo type to the "True Legendary Pulverizer"
+Added the new "LegendaryFusionCell" ammo type to the "Legendary Fusion Cannon" Secondary attack
*Fixed the shuffle sphere from XtraWeapons giving broken items/weapons
*Fixed "Commander Devastator" altfire DTBFG10K ball hitbox
+Added new pickup sounds to the "Commander Devastator" and "Legendary Devastator"
*Fixed the "Tech Erasus" not being able to shoot monsters below are above the player
*Changed the "Explosive Shotgun" and "Explosive SSG" to be the first weapons to select in slot 3

/////Complex-ClusterWeaponsV1.2 Changelog\\\\\
-Removed "Legendary minigun" and "Enraged minigun" 
-Removed the old unmaker
-Removed the "SuperCharged Rifle"
*Changed the "Super Charged BFG9500" and "SuperCharged DTBFG10K" to instead of being new weapons, they are now upgrades to the "BFG 9500" and "Demon Tech BFG10K" 
-Removed Runes that didn't work
*Changed the remaining 4 runes (Strength,Protection,HighJump and Drain) now they work like powerups 
+Added the strength, resistance and high jump to the item drops of "Corruption", "HellsMinister" and "LordArchon" respectively
+Added Effects to the 4 runes
++Now With the runes changed, cluster weapons no longer needs skulltag data file to work
*Changed the "Black Rune" into the "Void Rune", no longer pushes monsters, instead it Scares monsters away, added new sounds
+Added New idle and pickup sounds to the "Enraged Rune" 
*Changed the "Planet Cracker" to the "True Legendary Plasmatic Cannon" also Changed the Alt-fire
+Added new sprites to the "True Legendary Plasmatic Cannon"
*Fixed the Tech Erasus Projectile not being a fast projectile
*Fixed the True Legendary BFG ball laser attacks and sprite 
+Added new Effects to the "True Legendary Railgun"
*Fixed missing GLDEFs to the "True Legendary BFG15K" Projectile

/////Complex-ClusterWeaponsV1.3 Changelog\\\\\ Required update for compatability with Titanium's Xtra Stuff Addon
*Fixed removed weapons appearing in the SBARINFO and spawners
*Fixed missing weapons spawns 
*Fixed missing GLDEFS

/////Complex-ClusterWeaponsV1.4 Changelog\\\\\
+Added the Enraged Legendary Rune to all the enraged Legendary Monsters
+Added four new items "The Demon Heart", "The Legendary Demon Heart", "The True Legendary Demon Heart" and "The Nemesis Demon Heart"
+Added the hearts to randomly drop from each ultra sphere respectively 
+Added GLDEFS to the Skulltag runes
*Cleaned up the decorate files 
*Fixed the ammopacks not working if you had certain ammo types at full (now it doesn't check for full ammo)
*Buffed the "tech blaster", Increased Damage
*Buffed the "Legendary Karasawa" and "Enraged Legendary Karasawa" Increased Bounce Factor
*Fixed swiborg health/armor bonus effects 

/////Complex-ClusterWeaponsV1.4.1 Changelog\\\\\
*Fixed Hearts not working after a map change
*Fixed some enraged enemies not being replaced
*Fixed typo on enraged legendary zombie
*Fixed exos drops
*Fixed true legendary baby sentient drops
*Fixed the hearts not activating before the salvation spheres
*Fixed missing enraged monsters 

/////Complex-ClusterWeaponsV1.4.2 Changelog\\\\\
*Fixed missing enraged revenant 
*Fixed legendary rune not spawning
*Fixed random crash

/////Complex-ClusterWeaponsV1.4.3 Changelog\\\\\
*Fixed skulltag runes not working after a map change
*Fixed another random crash
*Fixed (finally) the ark backpack not spawning
*Fixed GLDEFs to every replaced monster

/////Complex-ClusterWeaponsV1.4.4 Changelog\\\\\
*Fixed the hearts not giving a silent ultrasphere

/////Complex-ClusterWeaponsV1.4.4.1 Changelog\\\\\
*Backpack don't need fixed they are not broken.  Use lca-ark-1.7.5.