Mature grotworm

Mature grotworms 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. Protect from Melee/Deflect Melee would work best for up close fighting. Range/Magic would require Protect from Magic/Deflect Magic if using safe spots.

Melee
Meleeing is the common way to kill grotworms, as they have a very low crush and low stab defence and mediocre slash defence. However, these grotworms will immediately launch a magic attack at anyone charging at them, making magic protection prayers an option to consider. Nevertheless, they are still pretty easy to kill with melee and good stats. For their level, they are extremely easy in comparison to something like Frost dragons. Using soul split, one could heal and stay as long as prayer potion supply allows. 80+ combat level is recommended.

Inventory
 * Helm: Full slayer helm/Black mask (task) > Torva full helm > Ganodermic visor > Helm of Neitiznot > Torag's helm
 * Body: Torva platebody> Bandos chestplate > Ganodermic poncho > Torag's platebody > Dragon platebody
 * Amulet: Amulet of fury > Amulet of glory > Amulet of strength
 * Legs: Torva platelegs > Bandos tassets > Ganodermic leggings > Torag's platelegs > Dragon platelegs/Dragon plateskirt
 * Shield: Dragon defender > Dragonfire shield > Chaotic kiteshield
 * Boots: Steadfast boots > Dragon boots > Bandos boots
 * Cape: Completionist cape > Max cape > TokHaar-Kal > Fire cape > Soul wars cape > Cape of Accomplishment
 * Ring: Onyx ring (i) > Berserker ring (i) > Dragonstone ring (i) > Berserker ring > TokKul-Zo > Ring of wealth > Ring of life
 * Gloves: Goliath gloves > Barrows gloves
 * Aura: Berserker > Reverence > Invigorate
 * Weapon: Chaotic longsword > Chaotic rapier > Abyssal vine whip > Abyssal whip > Brackish blade > Dragon scimitar
 * 16-20 pieces high-level food.
 * Emergency teleport
 * Beast of burden pouch
 * If using a BoB pouch, fill at least half of the inventory with food unless using anything below a Bull ant.
 * High Alchemy runes (optional); Alching Rune drops makes for a better profit than selling and reduces bank trips.

Prayer
Inventory
 * Helm: Full slayer helm/Black mask (task) > Proselyte Helm > Neitiznot Helm > Initiate helm > White helm
 * Body: Proselyte Hauberk > Initiate Hauberk > White platebody > Monk's robe top > (Any melee body of choice)
 * Amulet: Demon Horn Necklace > Split Dragontooth Necklace > Amulet of fury > Amulet of glory
 * Legs: Proselyte Cuisse/Tassets > Initiate Cuisse/Tassets > White platelegs/Skirt > Monk's robe bottom > (Any melee legs of choice)
 * Shield: Illuminated God Book > God Book > Faithfull shield > Dragon Defender > Dragonfire Shield
 * Boots: Bandos Boots > White Boots > Steadfast boots > Dragon Boots
 * Cape: Completionist cape > Soul Wars Cape > Max Cape > Trimmed Skillcape >TokHaar-Kal > Fire Cape
 * Ring: Onyx Ring (i) > Berserker Ring (i) > Dragonstone Ring (i) > Berserker Ring > TokKul-Zo > Ring of wealth (mainly for good drops potential) > Ring of life
 * Gloves: Goliath Gloves > Culinaromancer's gloves 10 > 9 > etc.
 * Aura: Supreme Reverence > Master reverence > Greater reverence > Reverence
 * Weapon: Chaotic longsword > Chaotic rapier > Abyssal whip > Brackish blade > Dragon scimitar
 * 8-12 Prayer potions
 * 8-12 pieces of high-healing food.
 * Emergency teleport
 * Beast of burden pouch
 * If using a BoB pouch, fill at least half of the inventory with food unless using anything below a Bull ant.
 * High Alchemy runes (optional); Alching Rune drops makes for a better profit than selling and reduces bank trips

Ranged
Ranging is a safe way to deal with these grotworms. Their magic attack has a low attack range, similar to Waterfiends, allowing players to make almost any safespot in their habitat, as long as they cannot move around it.


 * Helm: Full slayer helm/Focus sight (slayer task) > Pernix coif > Armadyl helmet > Karil's coif > Archer's helm
 * Body: Pernix body > Armadyl chestplate > Karil's top > Black d'hide body
 * Amulet: Amulet of ranging > Amulet of fury > Amulet of glory
 * Legs: Pernix chaps > Armadyl chainskirt > Karil's skirt > Black d'hide chaps
 * Gloves: Swift gloves > Mercenary gloves > Barrows gloves
 * Boots: Glaiven boots > Ranger boots > Snakeskin boots
 * Offhand: Eagle-eye kiteshield > Illuminated unholy book > Illuminated book of law
 * Weapon: Zaryte bow = Chaotic crossbow > Rune crossbow
 * Bolts: Broad-tipped bolts > Runite bolts
 * Cape: Completionist cape > Ava's devices > Arrowstorm drape
 * Ring: Archer's ring (i) > Onyx ring (i) > Dragonstone ring (i) > TokKul-Zo
 * Aura: Sharpshooter > Reverence > Vampyrism

Inventory
 * 12-14 Prayer potions (optional)
 * Emergency teleport
 * Beast of burden pouch
 * If using a BoB, fill it with a quarter or a third of items it can hold, as you will not be taking as much damage as needed.
 * High Alchemy runes (optional); Alching Rune drops makes for a better profit than selling and reduces bank trips

NOTES Bonecrusher does not seem to work on them

100% drop

 * }

Weapons

 * }

dragon dagger

Armour

 * }

Herbs

 * }

Seeds

 * }

Materials

 * }

Potions

 * }

Other

 * }

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.
 * The grotworms drop rune items very commonly making them a good source of money.