So everything worked fine on my expert + revengeance playthrouh until I fought Skeletron Prime with it only having 16k HP where he wouldn't die and stay at 1 HP, I had to turn off the mod to beat him, after that I wanted to get some more drops from the mechanical bosses and noticed their texture changed to vanilla and Destroyer is unkillable, I keep only hitting 1 with almost any weapon from the tier you are supposed to fight them with.

The first time against Destroyer I had no problem at all could damage it properly but now in a refight he has 150k HP and I keep hitting 1 on him, I tried to disable the mod and all of the sudden it works, it broke Magic Storage when I disabled the mod tho. So yeah wanted to share that issue.

For the mods, I had not like another mod active that alters AI or anything other then Calamity itself. I searched for others having this issue and found 2 other topics but I couldn't get any information from those other then it might be related to the mod. I did read previously that Skeletron prime summoned the other bosses in earlier versions of the mod I think it loaded that AI but didn't summon them and that is why he couldn't die and had such low HP for the final mechanical boss.

From what I played, mainly melee, I really like what you are changing to most of the weapons. I would like to see some changes to pre-mech and 1-2 mech boss melee weapons, since the balance is absolutely terrible there, The True Caustic Blade makes most of those weapons completely obsolete