Botania

Botania is a mod by Vazkii based around the magical energies created by flowers and other natural plant life. It is inspired by other magic-based mods, like Thaumcraft 4 and Blood Magic. There are magical flowers found around the world, which come in all 16 colors. The power system from Botania is called Mana, which requires aiming and time coordination of the blocks, due to the power not wanting to go to where you want it to go automagically. Mana can be used for infusions, enchanting and repairing tools, or powering magical utilities. There is an in-game documentation book that explains everything within Botania, which is called the Lexica Botania.