Magic Cuffs

Increases maximum mana by 20 and restores mana when damaged. Mana restored is equal to the damage of the attack before factoring armor, but will always be at least 7. Therefore, an attack that deals 7 damage while wearing 20 armor (thus having taken 10 points of damage negation) will restore 17 mana. Damage from drowning and Fire Blocks does not trigger this effect.

With the Arcane modifier, it adds another 20 mana, totaling to 40 mana extra. Due to its effects, it can remain useful well into hardmode and is extremely valuable to magic players.