Storm Diver's Additions Mod/Summoner's Core

The Summoner's Core is a hardmode accessory that is dropped from the Ice Queen. It increases the maximum number of minions and sentries the player can summon by 1 each, and it increases summoner damage by 10%. It also makes all minions and sentries cost no mana to summon.

Trivia

 * Unlike other Frost Moon drops, the drop rate for this accessory is not impacted by the current wave.