Event Horizon

The Event Horizon (イベントホライズン, Ibento Horaizun) is a new Zone used for Timewarp Summoning, located behind the Spell & Trap Card Zones. During either of the turn player's Main Phases, the player can place 1 monster from their hand into their Event Horizon. During each Standby Phase that a monster is in the Event Horizon, that monster gains 1 Eon Counter. When a monster has enough Eon Counters, the player can remove that monster from the Event Horizon and use it for a Timewarp Summon.

Despite being a clearly marked Zone, the Event Horizon is not actually considered part of the field, much like the Graveyard, so effects that effect cards on the field cannot affect cards in the Event Horizon: The effects must specifically target card in the Event Horizon.