Lanterns Boss Chest Farming: Hero City and Iron Harbor

1. Start in Crown Heights, Hero City, and defeat Plasma Brute.
2. Fly across Open Ocean toward Iron Harbor. Follow the crossing directions below.
3. Fight Sentinel Prime at The Spire in Iron Harbor. Use the boss name and The Spire label to identify the encounter.
4. Fly back across Open Ocean to Hero City, then return to Crown Heights to continue alternating between the two boss areas.

Plasma Brute's boss bar displays Level 40, while Sentinel Prime's displays Level 95. These are the bosses' levels, not minimum player levels for entering the fights. Consider the stronger second encounter when deciding whether to attempt the full route.

The table gives individual victory rewards, not a guaranteed chest grade for every defeat. Sentinel Prime's 100% describes the contribution in that victory; it does not establish a minimum contribution requirement.

1. From Hero City, head roughly east across Open Ocean toward the Iron Harbor destination marker and the high-rise skyline.
2. Look for blue-glass towers, a black-and-white striped lighthouse, and cranes along the coast to recognize the harbor city.
3. Approach above the buildings, then descend. The ENTERING SKYLINE AVENUE prompt identifies the district beneath you.
4. Slow down and continue toward the lighthouse plaza and harbor side. Your boss destination within Iron Harbor is The Spire.

NEXT QUEST can point to Apex Reach during this crossing. If it does, its distance can increase while you approach Iron Harbor. Navigate using the Iron Harbor marker and city landmarks instead of steering toward that unrelated quest destination.

Flight consumes ring energy, so check the RING meter before crossing and recharge before departure if it is low. On PC, use E to recharge and remain stationary while RECHARGING is active; moving interrupts active recharge. See the flight and recharge controls for takeoff and aerial inputs, or the location guide for other city landmarks.

Boss reward chests are added to Inventory automatically. You can keep them there and open them later.

1. Press I to open Inventory.
2. Select Chests to find your stored boxes.
3. Select a chest to view its details. For an Uncommon Chest, the available options include Odds %, Open Chest, and Upgrade to Rare.
4. Use Odds % to inspect its drop probabilities, or choose Open Chest when you are ready to open it.

The Uncommon Chest description highlights XP, Mastery XP, and a chance at the corresponding boss's constructs. Use its odds display when deciding whether to open it. Upgrade to Rare is a separate option from opening the chest.

For other chest sources and the Legendary Chest purchase and opening process, use the chest guide.