343 Industries kicked off the Xbox E3 Press Conference and revealed a cinematic trailer, a mission from Spartan Locke’s campaign, and the brand new multiplayer mode Warzone.

The BATTLE OF SUNAION mission demo shows Spartan Locke and the rest of Fireteam Osiris hunt down the Master Chief as the Arbiter fights off Covenant forces as this is their last stronghold. Locke’s team encounter new Promethean enemies: the Solider, and a Captain variant of the Soldier. They also encounter a brand new Forerunner air vehicle, the Phaeton – which is driveable in both campaign and multiplayer.

We witness a brand  new weapon called a Plasma Caster. The demo ends with a Forerunner like boss called the Warden Eternal.

Warzone is a brand new multiplayer mode where it’s 12 vs 12 and also features tons of AI enemies and marine allies.

Here’s the entire Halo 5: Guardians segment at this years E3