Undying Will

By offering your own blood as tribute, you push your very soul to the edge of mortality, allowing you to gain supernatural powers for a short while. As an action, you can pierce yourself with the appropriate blade required to reduce your hit points down to 1. Any temporary hitpoints are unaffected by this spell. Afterwards, you gain the following effects for the duration of this spell:

• Your speed increases by 10 feet.
• You add your Proficiency Bonus to all of your saving throws.
• You gain Advantage on Acrobatics and Athletics checks.
• You gain Advantage on all melee spell attacks.
• If you cast a spell that targets a single creature and requires them to make a saving throw, that creature gains Disadvantage on that roll.
• If at any point during this spell's duration you roll a 1 for your damage roll of a weapon attack or spell attack, you may reroll the die and must use the new roll.
• Your hit points cannot be reduced to 0.
• You are unable to recover hit points.

If you break concentration while this spell is active, you will remain at 1 hit point. If the spell ends after its full duration, you regain all of the hitpoints you lost before casting it. This spell can only end if your concentration is broken or if it lasts for the full minute. You cannot cast this spell when you are already at 1 hit point.