Artifactory adds a fully configurable attunement system to Minecraft: bond with your gear, grow more powerful as you use it, and choose carefully which items earn your limited attunement slots.
A highly configurable overhaul of Minecraft's way of progressing through the game : bosses, RPG-like, new mechanics, multiplayer compatibility, weapons, ores... !
An Iron Spells and Spellbooks addon that introduces new familiars scattered around the world, which you can tame and bring with you in all your adventures.