I was making a pack with several bosses in a Terraria-like progression system and I was using this mod to make enemies stronger after boss kills.

Currently, the enemies get stronger after every boss kill, which means if players want to re-fight bosses for drops it'll increase the difficulty, potentially making the game too difficult for that point in progression.

What I'd like to see is an option to increase difficulty for only the first time a specific entity is killed.

It'd be best if this was implemented alongside the current entityKill condition.