Urisk

Charge. If the urisk moves at least 20 feet straight toward a target and then hits it with a ram attack on the same turn, the target takes an extra 5 (2d4) bludgeoning damage. If the target is a creature, it must succeed on a DC 13 Strength saving throw or be knocked prone.

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

Depths of hell: an urisk is immune to fire damage and will regain hp equal to the amount of fire damage that is dealt to it.

Reckless: when the urisk makes an attack it can choose to take it with advantage, but any melee attack made against it will have advantage until the start of its next turn.

Multi attack:  the urisk makes two attacks on its turn. 

Ram. Melee Weapon Attack: +5 to hit, reach 5 ft., one target. Hit: 8 (2d4 + 3) bludgeoning damage.

Shortsword: melee weapon attack, +5 to hit, 5 foot reach. 1d6+3 slashing. 

Greatsword: melee weapon attack, +5 to hit, 5 foot reach. (2d6 + 3) slashing damage.

Fiendish made: As a bonus action, the urisk can sheath his weapon in flames. When done this way the weapon deals 1d6 extra fire damage on a hit.