Leech Curses are prayers from the Ancient Curses prayer book. Players must complete the Temple at Senntisten quest to access these prayers. Once completed, players can switch to the Ancient Curses prayer book by praying at the Altar of Zaros in the Zarosian temple beneath the Digsite.
The drain from leech curses must strengthen against every opponent. For example, a player could drain a monster's Attack by 8 levels, but if the player then fought another monster, the new drain would still start at 4 levels. Player boosts will carry across opponents, however, so if the player is fighting monsters constantly their boosts will stay at the maximum.
The amulet of zealots is compatible with leech curses, though the bonus accuracy and armour gained is notably less significant than the increased damage.
| Curse | Level needed | Effect | |
|---|---|---|---|
|
Leech Attack | 74 | Boosts  by 2 levels, increasing to 5 over time; drains enemy by 4 levels, increasing to 8 over time.
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Leech Ranged | 76 | Boosts  by 2 levels when determining hit chance, increasing to 5 over time; drains enemy by 4 levels when determining hit chance, increasing to 8 over time.
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Leech Range Strength | 77 | Boosts damage by 2%, increasing to 8% over time; drains enemy damage by 6%, increasing to 12% over time. (Enemy damage drain reduced to 4% to 8% in PvP) |
|
Leech Magic | 78 | Boosts  by 2 levels when determining hit chance, increasing to 5 over time; drains enemy by 4 levels when determining hit chance, increasing to 8 over time.
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Leech Magic Strength | 79 | Boosts damage by 2%, increasing to 8% over time; drains enemy damage by 6%, increasing to 12% over time. (Enemy damage drain reduced to 4% to 8% in PvP) |
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Leech Defence | 80 | Boosts  by 2 levels, increasing to 5 over time; drains enemy by 4 levels, increasing to 8 over time.
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Leech Strength | 82 | Boosts  damage by 2%, increasing to 8% over time; drains enemy damage by 6%, increasing to 12% over time.(Enemy damage drain reduced to 4% to 8% in PvP) |
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Leech Energy | 84 | Steals an enemy's energy and restores it to the player (10% every other hit). |
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Leech Adrenaline | 86 | Steals an enemy's adrenaline and restores it to the player (10% every other hit). This curse has no effect on monsters, as they do not use adrenaline. |
Trivia[]
- There is a graphical glitch that can sometimes occur to the leech curses at Clan Wars, Player-owned houses, and other portal-accessed PvP areas. One or more leech curses may appear outside of the portal and move very slowly in a random direction. It is not known how or why the glitch is caused, nor has it been addressed by Jagex.
- There is a glitch that occurs in Soul Wars that if a player has leech curses on and dies, the leech curse will come out of the player's respawn point and travel all the way back to the person it was cast on, sometimes going across the entire Soul Wars area. This has not yet been fixed.
- The sound of the leech curse happening is likely to be the sound of someone sucking blood.
