The Lightning Spire

This edged great spear is crafted from mithril and is inscribed with an elegant elven script.
{1} Masterwork quality: 1d10+1 slashing or 1d12+1 piercing base damage
{2} +1 to hit
{3} +1d4 lightning damage on strike {e}
{4} Once per short rest, the wielder can summon
an attack that does 3d10 lightning damage to all targets in a 30-foot line (DC 15 DX save halves damage) {e}