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X Thunder Fury is part of Lulu's Fury Overdrive, usable once Lulu has learned Thunder. It is 42% the strength of a regular Thunder, is a Rank 5 ability, and hits anywhere between 7 to 16 times after 15 rotations.
Thunder is the sound caused by lightning. Depending on the distance and nature of the lightning, thunder can range from a sharp, loud crack to a long, low rumble (brontide).