And also, if in your campaign Myrkul still exists, you could change the LAW domain for the UNDEATH domain instead, since Myrkul was a NE deity and not LE. Or instead of UNDEATH, you could place the TIME domain as Myrkul had many time-related aspects to his portfolio of Lord of the Dead, such as wasting, decay, and old age.
Good learning...
- The Sage of Perth: For all your Realms lore needs