Leech Energy, one of the Ancient Curses, steals run energy from a target in chunks of 10% every several hits. This prayer does not work against NPCs and therefore is only useful in PvP situations to prevent a player from running. Its usefulness is limited since players (with a decent agility level) can regenerate run faster than this curse can steal it. Due to its insignificance and high prayer drain rate, Leech Energy is rarely used.
All Halos reduce the drain rate of this prayer to 2/3 of the normal rate (0.33 times lower).
- According to the ancient hymnal, Leech Energy's verbal incantation is "Reple me nervis hostium." ("Fill me with the vigour of my enemies.")