Challenger Troll

Challenger Troll CR: 6

Large , chaotic neutral

Armor Class: 18

Hit Points: 126

Speed: 27 ft

STR

19 +4

DEX

12 +1

CON

20 +5

INT

5 -3

WIS

9 -1

CHA

5 -3

Skills: Regeneration - The troll regains 1d10 hit points at the start of its turn.  If the troll takes acid or fire damage, this trait doesn't function at the start of the troll's next turn.  The troll dies only if it starts it's turn with 0 hit points that don't regenerate.
Challenging Prescence - Any creature may choose to gain advantage on attack rolls made against the challenger troll, if they do the challenger troll gains advantage on any attacks made against this creature. 
Finesse Resistant - Weapons that allow creatures to use dexterity to add to the attack or damage rolls instead gain no bonus. 

Senses: Keen Smell - The Troll has advantage on Wisdom (Perception) Checks that rely on smell

Languages: Giant

Challenge Rating: 6

Actions

Multiattack - The troll makes three attacks, One with it's bite and two with it's claws
Bite - Melee weapon attack - +7 to hit, reach 5ft. One target.  (1d6 +4) piercing damage
Claw - Melee weapon attack - +7 to hit, reach 5ft. One target. (2d6 +4) slashing damage