Mature grotworm

Mature Grotworm can be found on the bottom level of the Grotworm Lair. They use slow, but very accurate magic and melee attacks. It is possible to safespot them using the pillars if you stand far enough back from them. As they are weak to stabbing and slashing attacks, weapons such as a Chaotic Rapier or Abyssal whip are good choices. Protecting from melee would work best for up close fighting. Far away combat would require protect from magic.

100% drop

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Armour

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Herbs

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Seeds

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Other

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Trivia

 * When this update first came out the rare drops did not come with it, Jagex decided to wait for the Queen Black Dragon update to release these.
 * "Monster drop tables will be expanded to include items related to the new, draconic armour mentioned in May’s Behind the Scenes."
 * The word 'grotworm' means caveworm in the Dutch language.
 * After the update, bonecrushers seemed not to be working on the big bones drops from these monsters, this bug has not yet been fixed.
 * Their examine text hints at another, stronger, grotworm based creature, although likely not an actual worm as "metamorphasis" implies, but none was released with them.