Destiny 2 Curse of Osiris – Tree of Probabilities Quest Guide

After discovering the location of the Infinite Tree map, it’s time to take action and deal with the Vex threat. Head back to Mercury and approach the quest marker for the Tree of Probabilities. This mission will once again take you through the Infinite Forest, so be prepared for combat. If you need more details about the Infinite Forest, check out our other guides (like Beyond Infinity).

Step 1: Start the Tree of Probabilities Quest

To begin the quest, head to Mercury and make your way to the quest flag located near The Lighthouse. Once you activate it, get ready for a challenging fight with Cabal enemies.

Step 2: Fight Through the Cabal & Enter The Infinite Forest

As soon as you start the Tree of Probabilities, Cabal forces will overwhelm the area between you and the Gateway. Clear them out, and then proceed to enter the Infinite Forest. You’ll need to fight through multiple Infinite Forest sequences until you reach the next tower. Before entering the tower, make sure to defeat all the Cabal surrounding it to break the barrier. Once you’ve cleared the area, proceed inside the tower where you’ll find a portal to a Cabal attack simulation.

Step 3: Cabal Attack Simulation

Once you enter the Cabal simulation, clear out the nearby enemies—there will be quite a few. Use your super or special abilities if needed. Afterward, hop on your Sparrow and make a jump across a gap. Ride along the path, ignoring most enemies, until you reach the Atlas Grove area.

At this point, the Cabal will launch a full-on assault to stop you from accessing the map. Fight through them until you reach the building. Be ready—this leads into a boss fight!

Step 4: Boss Fight: Valus Thuun

The third part of this mission is dedicated to the boss fight against Valus Thuun. The fight happens in three phases, each with a different room and set of challenges. Make sure you’re stocked up on power ammo and have your super ready.

Phase 1:

You’ll begin in the building’s entrance. Valus Thuun will attack directly, and adds will join the fight. As you damage Thuun, lasers will activate, dealing damage and creating hazards in the room. Once you’ve dealt enough damage, Thuun will retreat, and a Yellow Minotaur will appear in his place. Defeat it to move to phase 2.

Phase 2:

This phase is similar to phase 1 but takes place in a larger room with more adds. Again, Thuun will attack, and lasers will appear as you deal damage. Once you’ve reduced his health, he’ll leave, and another Yellow Minotaur will take his place. After defeating it, you’ll need to do some minor platforming to proceed to the third and final phase.

Phase 3:

The final phase mirrors the previous two but with Thuun now beatable. After taking him down, the room will open, and you’ll be able to access the map.

Step 5: Map Trap

After defeating Valus Thuun, a door will open, allowing you to access the map. Interact with the map to discover that more processing power is required. The Vex control the processing power, so your next destination will be Nessus.

This concludes our Destiny 2 Curse of Osiris: Tree of Probabilities quest guide. If you have any comments or suggestions, feel free to leave them in the comments below.