Bowmore
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Bowmore, good point! Dima probably told you about the skill that is actually located in the skill wheel under the Attack skill:
The "Devil's Strike" that you're talking about, I also noticed during gameplay, but didn't pay much attention to it. It's similar to Meteor Shower, but at a reduced cost. It's probably a bug that you brought to our attention. Thanks! Let's hope this information reaches the mod developer.
This spell can be used with the Chaos magic tome, and it deals MUCH more damage than Meteor Shower. I think the bug is that it can't be learned in any way.