Here's how we have handled it for my PC "Amirin" in the David Dunham's
Amirin performs first performs Enchant Thunderstone as a ritual, using the HeroQuest ritual magic rules, including community support, location and holy day bonuses, etc. In the ritual, Amirin dedicates the thunderstone to a particular foe. If the ritual is successful, he can apply the ritual bonus to one roll of his thunderstone-fighting ability in appropriate circumstance.
We've tried to limit the ability in some ways, to keep Amirin from piling up a bunch of super-powerful thunderstones. In general, Amirin can make a single stone every weekly, seasonal, or yearly holy day dedicated to his worst foe in the coming week, season, or year. The stone he makes "expires" at the end of the appropriate period. David has also said that Amirin might be able to create a longer-lasting stone dedicated to a specific enemy. Presumably the most specific the enemy, the longer it can last. Below is an example of how Amirin used his yearly stone (the one he made on the High Holy Day) against the Wolf Pirates in play. Tyloque is the Umathelan storm god, similar to Orlanth, while the Burning Men is our hero band.
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