Mature grotworm

This article has a strategy guide here.

Mature grotworms can be found on the bottom level of the Grotworm Lair. They use slow, but very accurate magic and melee attacks, however magic attacks are only used when outside of melee range. It is possible to safespot them using the pillars if you stand far enough back from them. As they are weak to crush, the Chaotic maul and the Tzhaar-ket-om are good choices. Protect from Melee/Deflect Melee would work best for up close fighting. Ranged/Magic would require Protect from Magic/Deflect Magic if using safe spots. They are not very crowded compared to other popular monsters.

Some players find it useful to bring runes to cast High Level Alchemy on some of the rune items the mature grotworms drop, to conserve inventory space.

It is possible to Dharok these safely despite the fact that they use two different attack styles. You have to stand next to the spawn point, and keep your health above 160 (their maximum hit with magic) at all times, turning on a melee protection prayer or curse and any other prayers and attacking it on crush mode as it spawns. Due to Dharok's greataxe's crush ability, this is one of the most efficient ways of killing them. A Ring of Life may be used for those experiencing lag or other problems.

The Bonecrusher now works as of 29 May 2012

100% drop

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Weapons

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Armour

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Herbs

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Seeds

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Materials

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Potions

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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.
 * Their examine text hints towards the possibility of the existance of a stronger grotworm based creature, although likely not an actual worm as "metamorphosis" implies, but none was released with them.
 * In mythology, dragons often begin life as worm-like creatures, for example the Lindworm and the Lambton Worm. This, along with their connection to the QBD, implies that they may be larval dragons, or closely related to dragons. Although, it is often spelled Wurm or Wyrm instead of Worm when refering to dragons.