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Discipline, Holy:

Your Shadow Word: Death can now be cast at any time, but deals 25% damage against targets above 20% health.

Casting Shadow Word: Death now also does damage to you equivalent to the damage it would do to an enemy above 20% health.

Shadow:

Your Shadow Word: Death can now be cast at any time, but deals 25% damage against targets above 20% health and does not generate a Shadow Orb when used against them.

Casting Shadow Word: Death now also does damage to you equivalent to the damage it would do to an enemy above 20% health.