Henri watches the efforts of the spellcasters to understand what is happening quietly. When one announces that the fishmen's tridents are magical he takes one and tests it carefully. "Could prove handy. If no one else minds, I'll take one of these," he says as he adjusts his gear to find a place for it.
Spoiler: Mechanics
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Add one +1 Trident to Henri's inventory. It's a bit redundant with his +1 Spear from the grindylows, but as a one-handed weapon I figure it might be useful in other situations.
If anyone wants it instead they can have either it or his +1 Spear instead.