Flattened hide

Flattened hides are dropped by Dagannoths located on Waterbirth Island. They can be used to make spined armour. Take a flattened hide, 10,000 coins and 3 Dagannoth hides to Sigli the Huntsman to create a Spined body. To do this, the quest Fremennik Trials must be completed.

Dropping monsters

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Trivia
If you look closely at the icon of the hide, you will notice some dark shadows, these seem to be a Dagannoth's spikes on its back, which means, that most hides dropped from Dagannoths are from their back.