The Olog-hai, T, is the most powerful type of troll in NetHack.

The name is derived from J.R.R Tolkien's works, in which the Olog-Hai were the Hill Trolls; a species of trolls that served the Witch-King while he ruled in Angmar and did not turn to stone in sunlight as many of their contemporaries did. Like all trolls, the Olog-hai revives after being killed. One way to stop them from coming back from the dead is eating the corpse before they revive.

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