As it would appear, the way that you are doubling HP (noMobs hook in the WorldProvider) is occasionally being called more than once - with the same LivingSpawnEvent.CheckSpawn event. This sometimes results in mobs with significantly more HP and attack than expected (Spiders with over 1K HP).
The degree to which their HP is multiplied, and the frequency at which higher scaling happens, appears to be tied to the monster's hitbox.
This only appears to happen in combination with other mods (For an instance of this, see the Stoneblock modpack)
I have yet to find the exact offending mod, but I figured it would be worth pointing out that this does happen.
As it would appear, the way that you are doubling HP (noMobs hook in the WorldProvider) is occasionally being called more than once - with the same LivingSpawnEvent.CheckSpawn event. This sometimes results in mobs with significantly more HP and attack than expected (Spiders with over 1K HP).
The degree to which their HP is multiplied, and the frequency at which higher scaling happens, appears to be tied to the monster's hitbox.
This only appears to happen in combination with other mods (For an instance of this, see the Stoneblock modpack)
I have yet to find the exact offending mod, but I figured it would be worth pointing out that this does happen.