Mature grotworm

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Mature grotworms can be found on the bottom level of the Grotworm Lair. They have slow, but extremely accurate, magic and melee attacks. However, magic attacks are only used on players outside of melee range, similar to monsters such as metal 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 and stab, the chaotic maul, goliath gloves, and chaotic rapier are good choices. Protect from Melee/Deflect Melee would work best for up-close fighting. An excellent alternative to prayer is to use Guthan's set to heal. Lower-level players are recommended to bring high healing food such as monkfish or sharks if Guthan's healing effect fails to occur. Ranged/Magic would require Protect from Magic/Deflect Magic if using safe spots. The magic attack has a short range, so flashing your prayer when out of its range can help conserve prayer points.

Some players may find it useful to bring runes to cast High Level Alchemy on the items dropped by the grotworms, as Adamant armour and weapons are common drops.

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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Raw Materials

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Potions

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Other

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Trivia

 * When these creatures were first released, they did not drop items from the rare drop table, but did after the Queen Black Dragon update.
 * The word 'grotworm' means caveworm in Dutch.
 * Their examine text hints towards the possibility of the existence of a stronger grotworm based creature, although likely not an actual worm as "metamorphosis" implies, but none were released with them.
 * When attacking a Mature Grotworm with Melee, the player's head is completely covered by the Grotworm's mouth.
 * Due to excessive botting, an update on 7 August 2012 removed several rune armor drops from the drop table of Mature Grotworms, replacing them with their adamant counterparts.