Rotting Presence. When any creature that isn’t a demon starts its turn within 30 feet , that creature must succeed on a DC 13 Constitution saving throw or take 1d4 necrotic.

Sure-Footed. The bulezau has advantage on Strength and Dexterity saving throws made against effects that would knock it prone.

Vogthad's Magical Bag. Vogthad is a collector of weapons. Using his stylized bag of holding as a collection. Any attempt at stealing or touching the bag while he is not holding it will result in his wards to go off and cause an explosion (6d6+20) destroy all the items inside.

Multi-attack. Can make Claw Or Random Weapon Attacks +4 to hit. (1d4+2)

Barbed Tail. Melee Weapon Attack: +4 to hit, reach 5 ft., one target. Hit: 8 (1d12 + 2) piercing damage. If the target is a creature, it must succeed on a DC 13 Constitution saving throw against disease. On pass half dmg. On fail target takes full damage and begin to violently throw up for one turn.

Even in death. Once reduced to 0hp Vogthad falls over and his body starts to boil and pus an expand. After a moment his body explodes into a 10ft radius around for (2d6+2) poison damage.

Now you see me.(3/day) Once A target is hit by a thrown Random Weapon. Vogthad can choose to jump to the target reprocing any target to be effected by his Rotting Presence.

Get in my bag.(1/day) Vogthad Points his bag open at a player speaking in Abyssal. "Banish!" Target rolls a DC 13 Wis save. On fail the target is teleported into the bag until the end of their next turn. Players inside the bag are among Vogthads massive collection. If they failed the DC by 2 have them roll a D100 to find a random weapon. 5% of it being magical.