If you get the +8 gold and Greater Trinket quest, using Hamuuls spell to refresh the tavern refreshes it with 0 units and spells in it, wasting the spell and wasting you 1 gold because you have to refresh to get a new tavern. This only happens if you have not used both charges of Guiding Candle yet. So if you roll twice first the spell will function properly, but using it before that will result in an empty tavern (No units or spells).
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