Circus Strongman

Burly. The Circus Strongman has advantage on all Strength checks and Saving Throws.

Muscled Performance. When making a Charisma check, the Circus Strongman may use it's Strength modifier in place of its Charisma modifier, so long as its muscles are plainly displayed. 

Multiattack. The Circus Strongman makes two Slam attacks, or it makes one Slam attack and uses Flex .

Slam. Melee Weapon Attack: +8 to hit, reach 5 ft., 1 target. Hit: 10 (1d8 + 5) bludgeoning damage. 

Flex. The Circus Strongman flexes its muscles, attempting to enthrall those around it. Creatures within 30ft of the Circus Strongman who can see it must roll a DC 16 Wisdom saving throw, or be charmed by it for ten minutes. On a success, creatures are immune to this Circus Strongman's Flex for 1 hour. An affected creature may repeat the Wisdom saving throw if it takes damage, or sees the Circus Strongman harm its companions.

Bodybuilder's Challenge: The Circus Strongman calls out one humanoid within 30ft of itself, challenging them to a flex-off. The creature must make a DC 16 Charisma saving throw, or accept the challenge. An affected creature has a speed of zero, and spends its entire turn flexing and posing in an attempt to show up the Circus Strongman. An affected creature can repeat the Charisma saving throw at the end of its turn, ending the effect on a success. Creatures with a Strength score of 13 or lower automatically succeed on this saving throw.