The Templars Homebrew DND Rules
Characters
General
For races that don't have a 5e equivalent, and for the DK's, you can use what's listed in Warcraft Heroes Handbook module.
Undead
Undead Traits
Immunities: Death effects, disease, poison, sleep, fatigue and exhaustion.
You have the Undead keyword. (You may be subject to things like Turn Undead, and are not affected by spells like Cure Wounds)