Fundamental Principles - Iron's Spells Addon

Casting spells builds up exhaustion, shown on a bottle icon that fills as fatigue rises. The level appears in the upper left corner of the icon and the exhaustion points appear at the bottom right. Exhaustion slowly drops over time, reaches a maximum of level 4, and each level carries a total amount of exhaustion before the next one. Accumulated exhaustion lowers the output power of spells. Higher rarity spells add more fatigue, and casting a spell of the same school as the last one adds less. The burnout effect stops casting entirely, and it is acquired by staying between exhaustion levels 4 and 3 while casting.

The mod also adds a rare critical event that can strike physical hits, with only a small base chance for each landed blow and only when certain conditions apply, such as the target having less than half its maximum health. Continued hits raise a mindful state up to level 3, granting +50% mana regeneration, removing exhaustion and burnout, and giving a greater chance for such hits. The mod requires Ace's Spell Utils, Geckolib and Iron's Spells 'n Spellbooks, and it is published for NeoForge 1.21.1 with the client and server both needing it.