Update
Arc One opens on Battlegrounds
Arc One’s front door is Battlegrounds.
It is a separate combat mode. You pick a public cursed technique, enter a free-for-all, fight, and respawn. Your regular CT, items, spins, pity, mastery and progression stay yours. /battlegrounds return brings you back.
The public wall
Gojo, Yuji, Megumi, Yuta, Mahito, Nanami, Todo, Inumaki. One Ultimate per life after the meter fills from real combat. Light Arc Coins, Pact XP, titles and cosmetics. Nothing sold here is combat power.
Supporter previews (Gojo V2, Yuta V2) are temporary access inside the mode. They are not ownership.
What did not move
Raids, Binding Vows, the Cursed Pact, clans, the Codex and the rest of Arc One are still there. They sit behind the wall, not in front of it.
Download the client. Press Play.