Thundering Power (3.5e Feat)
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Thundering Power [Metapsionic]
You can add a thunderclap to your electrical powers.
Benefit: On any power that deals electrical damage, you also deal 1 point of sonic damage per manifester level. This effect occurs on the same round that the power first causes electrical damage, and has no additional effect even if the power has a non-instantaneous duration. If a power allows the target to make a saving throw for half or no damage and the target makes their save, the sonic damage is also halved or negated. The power gains the "Sonic" descriptor. Using this feat increases the power point cost of the power by 2. The power’s total cost cannot exceed your manifester level.