Sources
CR
Type
Size
Alignment
Movement

Doomguard Rot Blade

Small/Medium Humanoid, Any alignment

Armor Class 18 (plate armor)
Hit Points 97 (13d8 + 39)
Speed 30 ft.
STR
18
+4
DEX
12
+1
CON
16
+3
INT
12
+1
WIS
10
+0
CHA
15
+2
Saving Throws STR +7, CON +6
Skills Perception +3
Damage Resistances necrotic
Senses passive Perception 13
Languages Common plus two more languages
Challenge 6 (2,300 XP)

Actions

Multiattack. The rot blade makes two Entropic Blade or Entropic Javelin attacks.

Entropic Blade. Melee Weapon Attack: +7 to hit, reach 5 ft., one target. Hit:9 (1d10 + 4) slashing damage plus 7 (2d6) necrotic damage. A creature killed by this attack has its body and everything it is wearing or carrying, except for magic items, reduced to ash. Hit or Miss:The rot blade can cause the blade to emit a burst of entropic magic in a 10-foot-radius sphere centered on the weapon. Each creature in that area other than the rot blade must succeed on a DC 13 Constitution saving throw or take 6 (1d12) necrotic damage. The blade can emit entropic magic in this way only once per turn.

Entropic Javelin. Melee or Ranged Weapon Attack: +7 to hit, reach 5 ft. or range 30/120 ft., one target. Hit:7 (1d6 + 4) piercing damage plus 13 (2d12) necrotic damage. A creature killed by this attack has its body and everything it is wearing or carrying, except for magic items, reduced to ash.

Lore

Rot blades are the entropic levers through which the Doomguard quickens the natural decay of the multiverse. These members wield weapons immersed in necrotic energy, which can turn their enemies to ash.