Blood Magic

Whether it be by some forbidden knowledge, dark pact, or desperate situations, you have somehow discovered the ability to infuse your own life energy into raw magical power. With this knowledge, you can the following features.

• Your Constitution score increases by 1
• Whenever you are attempting to cast a spell 1st level and above and do not have the spell slots available for it you may instead ritualistically sacrifice some of your own life force to fuel it and cast the spell. When casting a spell of 1st level with this feature you take 1 d10 + spell level as necrotic damage. If casting above 1st level you must add 1 d10 per spell level cast (I.E A 5th level inflict wounds would mean you take 5d10 + 5 necrotic damage). When damage is taken by this feature your maximum HP is also reduced by the same amount. This damage can NOT be resisted by any means. 
• Hp reduction by this feature lasts until you complete a long rest.
• If you are knocked unconscious by this feature the spell will still fire off first, however as soon as the spell is cast, you take the damage and would fall unconscious. 
• When casting a spell with this method any spell components are satisfied by the blood sacrifice