Deathmark One More Time

You have manifested a dragonmark. Determine its appearance. You gain the following benefits:

• Increase your Constitution score by 1, to a maximum of 20.
• Once per long rest you can recast a spell you cast in the last turn without negative effect. every time after the first use you take four hit dice of damage that cannot be healed by any means other than a long rest.
• The spell that is replicated is cast as a free action and a level higher than the last.