Blood Shield

You find and rip out a portion of your own life force, sharing it with your trusted allies.

Choose any amount of your current hitpoints and lose that much in hitpoints and maximum hitpoints. If casted during combat, roll d100 and round up to the nearest 25% instead (25%, 50%, 75%, 100%-1). The same amount is given to all willing allied creatures within sight (including you) as temporary hitpoints.

If your hitpoints are reduced to 0, all allies lose temporary hitpoints gained from this spell. If the ally is a summoned creature, the temporary hitpoints are lost upon unsummoning.

This spell ends only on a short or long rest. Your maximum hitpoints are restored and allies lose their temporary hitpoints.

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"ERGH! You lot... owe me a... healing potion and a... pint of ale... after this...! "