Xago, Fist of the Ruiner

Aggressive. As a bonus action, Xago can move up to his speed toward a hostile creature that he can see.

Second Wind   1d10+15 hp as bonus action - 1 per Short Rest

Action Surge   Take an extra action this turn - 1 per Short Rest

Improved Critical   Weapon attacks score a critical hit on a roll of 19 or 20 (Head Butt also gets this ability).

Chug healing potion  Xago carries 1 Superior (8d4 +8) and 2 Greater (4d4 +4) healing potions. (drinking time 1 Action or 1 Bonus Action as per your own campaign rules, also available as a legendary action)

Multiattack. Three melee weapon attacks OR Net throw plus one melee weapon attack OR one Grab & Head Butt attack OR one Shove & Stomp attack

Magical Great Flail (+2).  Two-Handed Melee Weapon Attack:  +13  to hit, reach 10 ft., one target. Hit: 21 (3d6 +8) bludgeoning damage. (re-roll 1s and 2s as per Great Weapon Fighting)

This Magical Great Flail (+2) is much bigger than a normal flail. It is two-handed and has reach. It is heavy.This flail is a three-headed flail.

Magical Heavy Net +3. Ranged Weapon Attack: +8 to hit, as per regular net except DC to escape is 15,  slashing damage to escape is 25 (AC10) (net not destroyed).
This magical net secretes acid. 2d4 on a successful hit then again at the start of each of the trapped targets turns. Xago can still do 1 melee attack as well as throwing the net. Critical hits do not double this damage.

(this net requires STR 20 to use. Not usable by Small or Tiny creatures)

Javelin. Thrown Melee Weapon Attack: +11 to hit, range 30/120 ft., one target. Hit: 9 (1d6 + 6) piercing damage.  Xago carries 3 javelins.

Grab & Head Butt  (Recharge 5–6). Special Melee Attack:   First is the grapple attempt as Xago grabs for the target. Xago's athletics (+11) Against the targets athletics or acrobatics. Regardless of the success of the grapple, the head butt is next. Melee Attack +11 to hit, one target. Hit: 27 4d8 + 6 bludgeoning (or 37 6d8 + 6 if the target is grappled). Upon successful hit the target must make a Con save (DC 19) or be stunned until the end of their next turn. The head butt uses the entire action. Xago's head butt is no ordinary attack, he has killed many men (and a few beasts) with a single Head Butt and when he senses an opponent could be killed by this move, he loves to finish with it.

Shove & Stomp (Recharge 5–6). Special Melee Attack:   First is the shove attempt as Xago tries to force the target prone. Xago's athletics (+11) Against the targets athletics or acrobatics. If the shove fails then Xago will likely follow up with 2 flail attacks. If the shove succeeds then the stomp is next, aiming at any sensitive area possible, usually the neck or head. Melee Attack +11 to hit only against prone targets (advantage on prone target), one target. Hit: 48 8d8 + 6 bludgeoning. 

Grapple. Replaces 1 Melee Weapon Attack: . Contest using Xago's athletics +11 against the target's Athletics or Acrobatics

Leather Bracers of Counterspell. 2 uses per day (recharges at dawn). As per the spell by the same name,  cast at level 3. No Somatic component just thought activated. Uses INT ability score if used by a non-spellcaster

Xago can take 2 legendary actions, choosing from the options below. Only one legendary action option can be used at a time and only at the end of another creature’s turn. Xago regains spent legendary actions at the start of his turn.

Chug healing potion  Xago carries 1 Superior (8d4 +8) and 2 Greater (4d4 +4) healing potions. (drinking time 1 Action or 1 Bonus Action as per your own campaign rules, also available as a legendary action)

Battle Cry (1/Day). Each creature of Xago’s choice that is within 30 feet and can hear him, and not already affected by Battle Cry gain advantage on attack rolls until the start of the Xago's next turn. (Xago also gets the advantage attack roll from his own battle cry)

 2 melee weapon attacks (Flail).  Two-Handed Melee Weapon Attack:  +13  to hit, reach 10 ft., one target. Hit: 21 (3d6 +8) bludgeoning damage. (re-roll 1s and 2s as per Great Weapon Fighting)