Hourglass

Hourglass is the tenative name of an item used by Momonga.

Description
The hourglass was used twice in the Overlord series. Once during his battle with Shalltear Bloodfallen, and during the Sorcerer Kingdom's war with the Re-Estize Kingdom.

Abilities
The hourglass is apparently capable of reducing the casting time for Super-Tier Magic to zero. Once the user has finally decided on which specific Super-Tier spell to cast, they can then break this hourglass in order to cast it at once right away.

Trivia

 * It was implied by Ainz's words that this hourglass is a cash item.