Grieving Tree
Eldritch Machine, Varies (Requires Attunement Using Lost Techniques)
A Grieving Tree is a giant skeletal tree made of the purest white marble, weighing thousands of pounds. One of the greatest inventions of the daashor Taruuzh, a Grieving Tree is part execution device and part torture device; a nearly inescapable prison that sustains victims on the very edge of death. The secrets to the tree's construction were lost with Taruuzh's death, as was the art of controlling them. To attune to a Grieving Tree, a character will have to rediscover these forgotten techniques.
Lingering Life
The tree has a pool of Hit Points. The pool starts at 20 Hit Points, and gains Hit Points whenever the tree uses its Eviscerate ability, to a maximum of 200 Hit Points. As long as there are Hit Points in this pool, whenever an imprisoned creature drops to 0 Hit Points but is still alive, that creature is healed 1d4 + 1 Hit Points and the same amount is subtracted from the pool.
Prisoners of the Tree
The tree can hold up to four creatures (or their corpses) at a time. A creature that is within 5 feet of a prisoner can attempt to free it from the tree by making a DC 20 Strength (Athletics) check. On a success, the prisoner is freed, and both creatures take 3d6 Piercing damage. On a failure, the prisoner remains in the tree, and both creatures take the Piercing damage.
Tree Control
While attuned to the tree and within 120 feet of it, you gain the following benefits.
Grab
You can take a Magic action to target a creature within 20 feet of the tree. The target must make a DC 24 Dexterity saving throw as the tree reaches down to snare them. On a failed save, the tree captures the target within its branches. The target takes 6d6 Piercing damage, and has the Stunned condition until it's released from the tree.
Eviscerate
You can take a Magic action to command the tree to eviscerate its unfortunate prisoners, draining their life and blood as the branches shake and quiver. All creatures Stunned by the tree take 8d6 Piercing damage, and half of the total damage dealt is added to the tree's Lingering Life pool.
Answer for Their Crimes
You can take a Magic action to cast Speak with Dead on the corpse of a creature imprisoned in the tree, without expending a spell slot or requiring Material components. When you cast the spell in this manner, the corpse is compelled to speak truthfully.
Release a Prisoner
You can take a Bonus Action to command the tree to release one of its prisoners.