Shroud of Darkness

If you would be dealt damage, you may banish this to prevent 2 of that damage.

Blood Debt

Rulings

This effect is optional. You may choose not to banish this and not prevent the damage.
This prevents damage from a single event of damage. Any leftover prevention amount does not carry over to another event of damage.

Keyword notes

Blood Debt - Blood Debt is a new keyword existing on Shadow cards. Shadow cards can inflict a loss of life to access a greater power. At the end of your turn, you lose 1{h} for each blood debt card in your banished zone.

You only lose life at the end phase. Players do not have priority during the end phase.
If you have multiple cards with blood debt, you lose 1 for each instance of blood debt at the end of turn.
Only face-up cards banished with blood debt counts and will lose you . Face-down banished cards have no effects or stats.