A heavy frame is a rare drop from demonic gorillas, which can be fought after the Monkey Madness II quest in the Crash Site Cavern.
They are a component in creating heavy ballistae. They must be attached to ballista limbs to create an incomplete heavy ballista. Doing so requires level 72 in fletching, granting 30 experience in the process.
Dropping monsters
Monster Combat level Quantity Rarity Demonic gorilla 275 1 Rare (1/1,500) Tortured gorilla 142 1 Very rare (1/15,000)
