The Forinthry Dungeon is a PVP-enabled area that is part of the Wilderness. It is entirely possible for other players to attack you whilst fighting the revenants in the dungeon. Do not bring equipment that you are not willing to lose.
Like all revenants, they can restore health quickly, can cure themselves of poison and react quickly to a player's protection prayers.
Drop rate of a specific item from revenant hellhound
Ancient Warrior equipment: 1 in 12,190
Corrupt Ancient Warrior equipment: 1 in 12,190
Corrupt dragon equipment: 1 in 39,440
A pair of brawling gloves (excluding Hunter and Smithing): 1 in 107,565
Brawling gloves (Hunter) or Brawling gloves (Smithing): 1 in 53,782
Ancient, Seren, Armadyl, Zamorak, Saradomin, or Bandos statuettes: 1 in 7,171 each
Ruby chalice, Guthixian brazier, Armadyl totem, Zamorak medallion, Saradomin carving, or Bandos scrimshaw: 1 in 3,585 each
Ancient psaltery bridge, Bronzed dragon claw, Third age carafe, Saradomin amphora, or Broken statue headdress: 1 in 2,390 each
These revenants can be used for either Ghost or Hellhound slayer tasks.
The examine text on this revenant has a mistake similar to the Revenant vampyre. When reading the examine text of this revenant, it says "The essence of a hellhound slain during the God Wars." However, the term essence in this text would mean their non-revenant versions would have a 100% drop of ashes of any sort, but their 100% drop are Bones instead.
Despite the fact they are slain hellhounds from the God Wars, revenant hellhounds have a lower combat level compared to regular and God Wars hellhounds, but hit much more higher than them.