Kamarula
Spoiler: Crafting
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You will be investing 2 Mana, as this would a process of discovery.
Your crafters make jars, in which black water can be held and fuses to light them. The process requires some experimentation with the black water, mixing it with other materials, found on the island. Their work produces masterwork Fire Jars 2 from 1 Black Water.
Flametongue design is a bit too complex for now, both conceptually and technologically.
Hell's Tribe
Spoiler: Crafting
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One craftsmen can turn 2 resources into 2 items per turn. Or 1 resource into 1 item per turn, but with a greater chance to make that item masterwork. If craftsmen fail, they'll just get regular item. So - it's quantity or quality. The odds are based on Craftsmen's skill, bonuses, and type of material.