This is related to #226, but at a lower level, improving the building blocks for widgets.

Would be very effective against regenerating foes (then we can add and/or improve foes that are very weak, but regenerate and possibly avoid melee to be safe from big hits that they can't regenerate against). Can be a throwing weapon, because swapping it in and out as a melee weapon worth it only for regenerating foes could be too tiring.

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