Epics of Suffering

Fixed Concentration check: Constitution DC10

You touch a willling/friendly creature and you create a common pool of hit points with them.

When you cast this spell the recepient receives the 'Epos of Pain' buff and cannot fall unconscious before you (the caster).
The statement above assumes that your concentration is not broken.
The recipient of the spell cannot feel the pain from damage, consequently no concentration saving throws for the recipient for damage.

However, the caster is required to roll the fixed concentration checks even on attacks involving the recipient.

• If the concentration is broken the hit points are divided equally.
      (The odd number remaining out goes to the recipient) after damage calculations.

Once the caster looses focus the shared pool is being divided back to the two creatures (recipient & caster).
If creature does not have the max, to accept these hit points he receives them as temporary hit points, until they complete a long rest or have the spell recast on them.

• If the caster falls unconscious the recipient is left with 1 hit point and this spell is effectively dispelled.
• If you have casted this spell to a creature you cannot cast it with another until the end of a long rest.