Lava scale shards are the result of using a pestle and mortar on a lava scale, which is dropped by lava dragons and brutal black dragons. Players obtain 3-6 shards from grinding a scale. If the hard Wilderness diary is complete, the player will receive 6-9 shards per scale.
It can also be obtained by using a hammer on an infernal eel, which has a requirement of 80 fishing, and yields 1-5 shards.
They are an ingredient for extended antifires which require 84 Herblore to create, as well as extended super antifires, which require 98 Herblore to create (1 shard per dose).