The 1.21.5 version of this project now works from 1.21.5-1.21.8, and the 1.21.1 version now works with newer versions of Entity Model Features and Entity Texture Features!
/function cc_config_disable_book_on_death: Makes players no longer receive the Crimson Survival Guide upon death.
/function cc_config_enable_book_on_death: Makes players receive the Crimson Survival Guide upon death (enabled by default).
Kraken:Acid-Ball cooldown nerfed from 0.05—>1 sec (this change is from V1.4, but wasn’t listed in the changelog).
Drill: Now has a limited lifespan (this change is from V1.4, but wasn’t listed in the changelog).
Fixed an issue with dying messing up players' ID-scores to not match their team-name, which caused various different PvP issues (it is recommended to use the command /scoreboard players reset @a when loading up a game to ensure this fix works)
Juggeraut: Metallic and Purified Bow Arrows will no longer have their On-Impact Ability activate when a Juggernaut deflects them; Can no longer be forced out of their curl position early by attacking above their hitbox(1.21.5); Can no longer spawn as baby variants; Will no longer attempt to deflect Metallic Bow Shrapnel.
Drill: now uses the same block taglist for the blocks it will break, and the blocks it won’t explode upon when colliding with.
Sweeping Melee Weapons (General): Melee weapons will no longer have their on-hit sound effect or ability activate multiple times when hitting multiple targets (Claw Dagger was excluded from this fix, since it was always intended to work this way) (this change is from V1.4, but wasn’t listed in the changelog).
Dash Weapons (General): Their Dash-Silhouette effect no longer orients with the user’s vertical-head angle (or their pitch) (this change is from V1.4, but wasn’t listed in the changelog).
Singularity Enchantment: Lore no longer says that the enchantment doesn’t work on players (since that isn't true anymore).
Crimson Repeller: Crimson Repeller from the Special Gear chest now has the same lore as the one you craft.

A virus dormant in the Crimson Forests of the Nether escaped to the Overworld. Now with access to water, it began evolving into horrors one could only imagine....