Cockatrice

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You may mean Spirit cockatrice or Chocatrice.

Cockatrice are Slayer monsters that require level 25 slayer to kill. They frequently drop Limpwurt roots used in the Herblore skill. Players need to use a mirror shield when fighting these.They are located in the dungeon east of the troll with the golden apple tree.

Locations

 * Fremennik Slayer Dungeon

Strengths and weaknesses
Players must use a mirror shield when fighting these. If a regular shield or no shield at all is equipped the cockatrice will use its stare to quickly reduce a player's stats to dangerously low levels. They have few hitpoints and do not hit particularly hard unless the player forgets the mirror shield.They are located in the dungeon east of the troll with the golden apple tree.

100% Drop
Bones

Other

 * Coins (1, 5, 15, 28, or 62)
 * Level 2 Clue Scroll
 * Limpwurt root (very common)
 * Cockatrice head (rare)
 * 5 Rune Javelins (rare)
 * Half of a key
 * Mystic boots
 * Cockatrice egg (common)
 * Chaos talisman

Gems

 * Uncut Sapphire
 * Uncut Emerald
 * Uncut Ruby

Runes

 * 2 Law runes
 * 2, 4, or 6 Nature runes
 * 2 Water runes
 * 7 Fire runes

Weapons/Armour

 * Iron javelin
 * Steel dagger
 * Iron sword
 * Steel longsword
 * Iron boots

Summoning Charms

 * Gold charm
 * Green charm
 * Crimson charm
 * Blue charm

Herbs

 * Guam
 * Marrentill
 * Harralander
 * Tarromin
 * Irit
 * Avantoe
 * Kwuarm
 * Dwarf Weed
 * Ranarr
 * Lantadyme
 * Cadantine

Seeds

 * Potato
 * Onion
 * Cabbage
 * Strawberry