Lightblade's Final Strike

As a desperate attempt to destroy your target, you draw upon your own life force as the source of this potent - but costly - attack. As you close your eyes for a brief moment of concentration, your skin splits, and blood flows freely from your wounds to your weapon, where it transforms into a swirling vortex of blinding, silver light. You swing your weapon, releasing the burning wave toward your enemy. Make a ranged touch attack to determine if you strike your target. If you succeed, roll weapon damage as if you had struck a critical hit with your weapon; if you rolled within your weapon's critical range on the touch attack, increase the critical multiplier by +1 - no confirmation roll is required. In addition, you may sacrifice any number of your hit points to further increase the damage. For every 20 hit points you sacrifice, increase the critical multiplier of your weapon by +1. You can choose to expend these hit points after you determine if your ranged attack roll is successful but before rolling damage. All damage this spell deals is holy. Casting this spell exhausts you for 1 hour. SPELL DESCRIPTIONS For example, Lightblade, wielding a bastard sword, is fighting a losing battle against a black dragon and decides to make a final gamble to try to destroy the beast. He casts the spell and rolls a 19 for his ranged touch attack, which hits and is a critical threat. He chooses to sacrifice 80 hit points (enough to make him unconscious but not kill him outright). He rolls damage; the result is 25 points of damage. This damage is multiplied by 7, since his weapon has a x2 critical normally, he rolled a critical threat, and he sacrificed 80 hit points (80 divided by 20 = 4). The spell deals 175 points of holy damage to the dragon.