Unwavering Initaite

Embalm. Once the unwavering initiate is killed the summoner of the initiate may use their action and make a DC 13 Medicine or Arcana check to revive the unwavering initiate but they now classify as an undead rather than humanoid, the unwavering initiate lasts for 1d4 rounds after this is done (on the final round at the end of their turn they are unsummoned). 

Multi attack. The unwavering initiative makes two weapon attacks. 

Katar. Melee Weapon Attack: +5 to hit, reach 5 ft., 1 target. Hit: 6 (1d6 + 3) piercing damage. 

Spear. RangedWeapon Attack: +5 to hit, range 20/60 ft., 1 target. Hit: 6 (1d6 + 3) piercing damage.

Enter the description for how bonus actions work for your monster here.

Counter Attack. In reaction to a creature making an attack roll against the unwavering initiate whilst within 5ft of it the initiate can make one spear or katar attack against that target.