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Anyone may seek its help if they want to learn something.
Keeper of Forbidden Knowledge: The Tree of Whispers has gathered a massive amount of arcane secrets over its existence and is willing to part with some. Fate Worse than Death: Anyone who gets a secret from it will eventually have their heads removed from their bodies upon death and strung up to dangle from its branches, undying, conscious, but immobile, for the rest of time. However, if someone tries to cheat it, it will dispatch its agents to hunt them down and collect their debt the hard way. Normally it will leave a victim to live the remainder of their lives in peace and only collect after they die on their own. Once it tells you a requested secret, you're marked to have your head join the others hanging from after death it for eternity. Deal with the Devil: To gain knowledge from it is to seal your fate. People who spend their lives studying the ancient lore of creation admit to not having the slightest idea how to explain it. Botanical Abomination: It looks like a gnarled, dead tree, but is a sentient supernatural entity of unknown powers and origins that shares forbidden knowledge to those willing to pay its price. It just didn't know what or where the coffin leads to, and didn't get its own agents to investigate it before the Wanderer came along. To add salt to the wound, it does have some idea of how Elias gained his immortality after all, it did (vaguely) know the existence of the coffin gateway. Elias' attempt to cheat it especially infuriates it because, since it has no true knowledge of immortality or how to break it, it's effectively powerless to stop him and needs the Wanderer's help to do so. Berserk Button: The Tree always collects its debts, and has no tolerance for anyone who tries to escape from their end of the deal. It is upfront with its targets and never forces a deal, but it will collect any debt it is owed with ruthless efficiency. The only thing it seems to care about it gathering as much information for itself as possible. It has no preference between or grudges towards Heaven, Hell, or Sanctuary and seemingly has no overarching agenda of its own.
Above Good and Evil: As sinister and disturbing as it is, the Tree of Whispers seemingly has no morality of its own. It is found in Hawezar, and the region largely lies within its shadow. As its name may suggest, it knows many secrets and is willing to share them, for a price.
While nominally a tree, it can be considered a character by itself. being note It is listed here precisely because it doesn't fit into the existing categories introduced in IV. Per wiki policy on Handling Spoilers all trope names are visible and may contain spoilers on their own. This page lists character index pages of Diablo, Diablo II, Diablo III, and Diablo IV sorted by their race and allegiance.