Adventure Chests no longer spawn as static objects guarded by mobs. Instead, players earn chests by defeating Marauders scattered across the Adventure map. Each Marauder provides progress toward earning a tier of chest. Here are all of the tiers of chests you can get:

Tier Chest Type Loot
Basic The Default Basic chest contains a basic amount of loot that can be found in a normal Adventure chest.
Elite An Aqua Particle’d Elite chest contains higher-quality loot than a Common chest and provides additional rewards.
Legendary A Gold Particle’d Legendary chest contains valuable loot, including advanced items and rare materials.
Godly A Red Particle’d Godly chest contains highly sought-after loot and exclusive treasures.
Heroic A Pink Particle’d Heroic chest contains rare Island-focused items and additional rewards.
Mythic A Purple Particle’d Mythic chest contains extremely rare PVP-focused items and exclusive gear.

Chest Loot Table Run the command /adv and click on the chest below the adventure you want to see the loot for.