Start off by progressing the story until you defeat the first world boss. Next, enter the Labyrinth
and work your way to the center where you will find the Keeper
. The Keeper will give you the Biome Portal Key
which is required for reaching Leto’s Stash.
Now, fast travel to the Fractured Ingress
checkpoint in the Labyrinth. From there, take the path on the right until you reach a portal on a ledge. Next, walk behind the portal on the ledge and carefully drop off into another portal below. After dispatching the enemies, take the next portal on the left. Then, duck under the wall on the left side, climb to the top of the wall, and jump over the portal you recently came out of.
Continue along the path until you reach a locked gate. Use the Biome Portal Key to open the gate and take the portal back to Ward 13. In this room you will find the Chicago Typewriter
and Leto’s Stash
which contains the full Leto Mark II armor set.