This magical longsword feeds on the ambition to be victorious and feeds that power with the wielder’s blood. Once attuned, this sword is a magical weapon, but you have no bonus to attack and damage rolls made with this magic weapon.

However, when you take the Attack action on your turn you can feed the sword your own hit points (up to three per round). You have a bonus to attack and damage rolls made with this magic weapon equal to the hit points sacrificed until the start of your next turn.

The loss of hit points due to sacrificing them to the blade cannot be prevented by any spell or effect, and do not come off of temporary hit points or any other additional hit points. The attack and damage bonuses are always the same. You cannot sacrifice two hit points and gain a +4  bonus to attack rolls and no bonus to damage rolls, for example. If you wish to gain magical bonuses from the sword not based on any other outside effect (like spells or abilities), you must sacrifice the appropriate amount of hit points again. This sacrifice, if any, only affects the bonus of the sword itself. Ability score modifiers, as well as any outside modifiers, if any, still apply.

The more hit points you fed the sword, the redder the blade becomes. One hit point fills the fuller with blood. Two hit points turns the blade red save the edge. Three hit points turns the blade entirely red and it drips with blood.

If you die while attuned to the sword you cannot be revivified, raised or resurrected as you soul becomes trapped in the blade. A hallow spell (Everlasting Rest) cast upon the blade will free all trapped souls and allow for a raise dead or resurrection spell to be cast..