Catablepon

Catablepon are monsters that look like green bulls with reptilian tails. They are found on the third level of the Stronghold of Security. They use the magic spell  Weaken(which appears as a spraying white sparkle) to drain up to 15% of their opponent's maximum  Strength level. Players with low Strength are not advised to train on these with melee, as Weaken can drain their Strength quite significantly, unless strength potions or  restore potions is used. They can melee attack and cast Weaken at the same time. After the spell has decreased 8 strength levels, Catablepon will stop casting Weaken.

Location
They are found in the third floor of the stronghold of security

Drops
44 Coins

2 Law runs

2 Cosmic runes

15 pure essence

6 coal (noted)

Top of sceptre

Unlit torch