Homebrew
Undead Fortitude. If damage reduces the Shadowfell Gnome Fighter to 0 hit points, it must make a Constitution saving throw with a DC of 5 + the damage taken, unless the damage is radiant or from a critical hit. On a success, the gnome drops to 1 hit point instead. Shadow Stealth. While in dim light or darkness, the Shadowfell Gnome Fighter can take the Hide action as a bonus action.
Multiattack. The Shadowfell Gnome Fighter makes two attacks with its Shortsword. Shortsword. Melee Weapon Attack: +5 to hit, reach 1 sq., one target. Hit: 7 ( 1d6+3 ) piercing damage. Necrotic Strike. Melee Weapon Attack: +5 to hit, reach 1 sq., one target. Hit: 10 ( 2d6+3 ) necrotic damage.