Isaac’s Addons

Isaac’s Addons is a mod designed to increase game difficulty and slow down game progression.

– Three new items (Deepslate Alloy, Reinforced Iron and Diamond Shards)
– All damage taken is multiplied by 2.5x + 1 extra heart of magic damage is added to all damage taken (magic damage bypasses armor).
– Only 33% of blocks drop an item
– Permanent Slowness 3, Mining Fatigue 2 and Weakness 1
– Linear progression is forced (Wood, Stone, Iron, Diamond, Netherite) (Leather -> Iron -> Diamond -> Netherite) so you can’t craft an armor piece/tool without that same piece from the previous set.
– Crafting recipes for tools and armor are much more difficult (A stone set costs a total of 88 cobbled deepslate or 792 cobblestone, an iron set costs a total of 280 iron ingots, a diamond set costs a total of 216 diamond shards which a diamond ore now drops 0-3 diamond shards)
– All undead mobs get speed
– All spiders are invisible
– You can no longer get iron ingots/tools/armor, diamonds/diamond tools/diamond armor, netherite scraps or netherite ingots from naturally generating chests.
– Villagers despawn 1 tick after spawning, effectively removing them from the game.