It can be made by a player with 84 Herblore by mixing a regular antifire and Lava scale shards, which grants 110 Herblore experience if they put in four shards into an antifire (4). 27.5 Herblore experience is granted per shard added. One dose is created per shard, so four shards will be needed to create a four-dosed extended antifire. Players with at least 91 Herblore can mix caviar into a 2-dose Extended antifire mix.