Mana

Mana is a type of energy used to perform magic in Kamen Rider Wizard. Gifted humans known as Gates house monsters in their Underworld known as Phantoms, made from mana. When a Gate gives in to despair, the Phantom awakens and proceeds to break out of their Underworld, killing their Gate and taking their form.

Mage Kamen Riders like Haruto Soma/Kamen Rider Wizard, as well as presumably the White Wizard, the Golden Wizard, and the Kamen Rider Mages, utilize mana. Koyomi, a Gate whose body remained intact after her Phantom broke out but was rendered a doll human, required regular infusions of mana from Haruto via the Please Wizard Ring to keep her alive. Should Haruto run out of mana, he will be unable to perform magic, resulting in an "Error" sound when a Wizard Ring is scanned on the WizarDriver. Some Phantoms such as Medusa can siphon mana, which she does using her hair of snakes. Wiseman can also suck the mana out of a target such as Wizard, draining him almost instantly with almost no effort.

A unique Phantom from ancient times Beast Chimera was a cannibal who consumed other Phantoms and Ghouls by absorbing their mana for food. He was sealed in the Beast Driver until it was discovered by archeologist Kosuke Nito, the Phantom formed a pact with him and entered his Underworld. Kosuke would use the Beast Driver to become Kamen Rider Beast to defeat Phantoms for Chimera to eat. The catch was that Kosuke constantly needs to hunt down Phantoms to feed Chimera or he will die. Haruto offered to supply Chimera with mana via the Please Ring, but the Phantom refused to be simply given mana rather than taking it.