Bondable Sinstone
Drops from Taskmaster's Trove. PSA: If you use and at the same time, they will argue when one says something, LOL.
Bondable Sinstone is a toy dropped from Taskmaster's Trove in Revendreth that summons a demon companion to your shoulder.
Guide awaiting review
Travel to Revendreth
Navigate to Revendreth and head to the Taskmaster's Trove at 62.97, 73.5.
Click the parchment roll
Click on the parchment roll at 62.96, 72.35 in Revendreth to phase and reveal the chest containing this toy.
Dodge blue spheres and loot
Avoid the blue spheres in the phased area and interact with the nearby chest to obtain Bondable Sinstone.
Tips
If you have Demonic Circle as a warlock, set it near the loot spawn location before phasing—teleporting does not despawn the orbs, allowing you to retrieve the toy effortlessly.
Pair Bondable Sinstone with Bondable Val'kyr Diadem at 70.49, 36.48 in Bastion to trigger amusing interactions between the demon and angel companions arguing over your soul.
Use the macro '/showtooltip /use Bondable Sinstone /use Bondable Val'kyr Diadem' to activate both toys simultaneously for the full shoulder companion experience.