Thick Hide. Any bludgeoning damage or cold damage against the beast will be reduced by 1d4 to a minimum of 1 damage. (this is a stand-in for resistance to bludgeoning cuz resistances are a little wack) Soft Flesh. Any slashing damage or fire damage against the beast will be increased by 1d4. (this is a stand-in for vulnerability)
Multiattack The scourge beast makes 2 claw attacks and one bite attack. Bite. Melee Weapon Attack: +4 to hit, reach 5 ft., one target. Hit: 8 (1d10 + 4) piercing damage. Claw. Melee Weapon Attack: +4 to hit, reach 5 ft., one target. Hit: 7 (1d8 + 4) slashing damage. Beast's Roar. Once per combat the scourge beast may let out a roar forcing every enemy in a 20 foot circle around it to make a dexterity saving throw or be knocked 10 feet away and prone.