Minecraft too easy? Try this mods with nearly 40 modifiers - settings new mini bosses, which made minecraft become hard & insane. Enhanced hostile mobs' AI. Zombie place/break blocks. Skeleton,Spider,Creeper,Enderman.
A bridge mod unifying Electroblob's Wizardry, Scape and run: Parasites and Spartan Weaponry, into my Battlemage late-game fantasy, Custom Gears, Spells, Skills, Bauble Fruits + few other things/tweaks
An addon to the "Boss Rifts" mod that allows bosses from various mods if they aren't registered under the #forge:bosses tag to spawn boss rifts upon death.