
Fearsomeness
Is a small mod that adds the... Well, Feared effect!
When active on any entity, all mobs in the scaredycats entity types tag have their spawning disallowed if they're within 48 blocks of the entity with the Fearsomeness Effect.
By default, this is limited only to Ghasts. Please add to this tag whatever you like in your modpack!
The potion to create this effect is brewed with a Wither Skeleton Skull (also tag-based, editable in the fearsomeness_potion_ingredients items tag) and lasts for one real-world hour, or 3 in-game days.
I created this mod to allow the Naga from Mowzie's Mobs to spawn frequently at first, but then disallow their spawning for a long time after they've been killed in my modpack, Resurvival.
I hope you find this mod useful! :D