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, similar to monsters such as metallic dragons and Cockroach soldiers. 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. An excellent alternative for prayer is to use a full set of guthan's for it's healing abilities, which will save food and prayer management. For players lower than cb lvl 120, a few pieces of food (even lobster will work) for a bad round of fighting will protect most everyone from accidental death. Ranged/Magic would require Protect from Magic/Deflect Magic if using safe spots.

Some players may find it useful to bring runes to cast High Level Alchemy the items dropped by the grotworms, as Rune armor/weapons are very common drops from them.

The Bonecrusher now works as of 29 May 2012.

100% Drops

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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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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.
 * The word 'grotworm' means caveworm in the Dutch language.
 * Despite being such a low levelled monster, the loot received would be similar to that of a level 250+ monster. It might be an oversight or intentional by Jagex.
 * 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.