Same thing happened to me with thief on a barbarian.
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Also enjoying the game and found a bug...
Was facing Cornelius as a Witch. Joined the Witch Guild, had Burning Light, Lightning Bolt, and Duplicate+(in upgraded slot). Had 26 Health, Cornelius also had 26 (I believe). Cornelius finished his turn, my 3 dice generated interface for the spells did not. Upon clicking a die, UI totally crashed with the Aw, Snap! sad face icon. SAD FACE!! :(
Fun game, excited for more updates!