Projected Burst (3.5e Equipment)
From D&D Wiki
 Projected Burst
A projected burst weapon accumulates raw magical energy within its blade that can be released as a full action in a cutting motion. The energy is released in a straight, 5 ft. line with a reach equal to ten times the reach of the enhanced weapon in its wielder's hands. Any creature that this line passes through is dealt 10d6 raw magical damage, Reflex half. The damage is of a raw magical kind, that is not subject to any damage reduction or immunity. After using the enhanced weapon's projected burst attack, it can not be used again for 1d4 rounds. Making a projected burst attack provokes an attack of opportunity from everybody that threatens the wielder.