Catablepon

Catablepon are monsters that look like green bulls ready to charge and are found on the third level of the Stronghold of Security. They are aggressive to all players, regardless of combat level. They use Weaken to drain strength by up to 15% of their opponent's maximum level. It should be noted that they can attack and cast Weaken at the same time. They also seem to have an unusually high drop rate for clue scrolls, although they should not be used for training as the weaken can be well weakening unless you have a strength potion.In the northwestern most room of the third level, there is an excellent safe spot for using Magic, Ranged, or using a halberd on catablepon, to the immediate west of the square patch of tendrils by the skeletons, in the center east room there is also a safe spot. It is unique among F2P monsters in that it has a 2-space melee attack, but only hits diagonally.

Drops
100% drop: Bones

Runes

 * 15 Fire runes
 * 7 Water runes
 * 7 Chaos runes
 * 2 Law Runes
 * 2 Cosmic runes

Gems

 * Uncut sapphire
 * Uncut emerald
 * Uncut ruby
 * Uncut diamond

Other drops

 * 15-97 Coins
 * 15 pure essence
 * 5-14 adamant arrows
 * 5-14 mithril arrows
 * 3-7 noted Coal
 * Trout
 * Salmon
 * Eye of Newt
 * Adamant medium helmet
 * Top of sceptre - part of the Skull sceptre (very rare)
 * Nothing

Seeds

 * 1 Tomato seed
 * 1 Onion seed
 * 1 Sweetcorn seed
 * 1 or 4 Potato seeds
 * 2 Cabbage seeds
 * 4 Evil turnip seeds

Herbs

 * Grimy guam
 * Grimy marrentill
 * Grimy avantoe
 * Grimy kwuarm
 * Grimy irit
 * Grimy cadantine
 * Grimy ranarr
 * Grimy lantadyme
 * Grimy dwarf weed

Charms

 * Gold charm (common)
 * Blue charm
 * Crimson charm
 * Green charm

Other drops

 * 15 Pure essence (noted)
 * 5 Rune Javelin (extremely rare)
 * Level 2 Clue scroll
 * Unlit torch (very common)
 * Nature Talisman (rare)
 * Half of a key
 * Nothing

Trivia

 * Players who tried to say "catablepon" in-game once found that the last three letters were blocked by the chat filter. That glitch was later fixed.
 * This monster was one of several to be created in-game after having been suggested by a player in the Suggest-A-Monster sticky in the Suggestions section of the RuneScape Forums.
 * Catablepon are based on a mythical Ethiopian creature called a Catoblepas.
 * When asking a Slayer Master for a tip about this creature, you can get the reply: "Catablepon are cow-like, magical creatures that mainly live in the Stronghold of Security. Beware their weakening glare; cutting off their head could help." This may hint that catablepon may someday appear in some other location. It also indicates that 'catablepon' is both the singular and plural form of the word.