Champion Gundyr

Action Surge (2/day). Champion Gundyr can take an additional Action once per a turn.

Mage Slayer. Champion Gundyr have practiced techniques useful in melee combat against spellcasters, gaining the following benefits: When a creature within 5 feet of him casts a spell, he can use his reaction to make a melee weapon attack against that creature. When he damages a creature that is concentrating on a spell, that creature has disadvantage on the saving throw it makes to maintain its concentration.

Magic Resistance. Champion Gundyr has advantage on saving throws against spells and spell effects.

Magic Weapon. Champion Gundyr's weapons are magical.

Turn Resistance. Champion Gundyr has advantage on saving throws against any effect that turns undead.

Charge (4-6 Recharge). Champion Gundyr charges forward in a 50ft long and 10ft wide line, creatures in that line can make a DC 19 Dexterity saving throw, taking 10 (4d6) piercing damage and being knocked prone on a failed save, or half as much and not being knocked prone on a successful save.

Stomp (5-6 Recharge). Champion Gundyr slams his foot down, creatures within 10ft must make DC 19 Strength saving throws or be knocked back 15ft and prone on a failed save, nothing happening on a successful save.

Multiattack. Champion Gundyr can make 2 Halberd, 1 Kick, and 1 Body Slam; or 2 Body Slam and 2 Kick attacks; or 1 Charge or Stomp (if it can) and 3 Halberd attacks.

Kick. Melee Weapon Attack: +10 to hit, reach 10 ft., 1 target. Hit: 17 (2d8 + 8) bludgeoning damage, those hit must make a DC 19 Strength saving throw or be knocked prone.

Body Slam. Melee Weapon Attack: +10 to hit, reach 10 ft., 1 target. Hit: 17 (2d8 + 8) bludgeoning damage, those hit must make a DC 19 Constitution saving throw or be stunned until the end of their next turn. 

Halberd. Melee Weapon Attack: +10 to hit, reach 20 ft., 1 target. Hit: 24 (3d10 +8) slashing damage. 

Champion Gundyr can take 3 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. Champion Gundyr regains spent legendary actions at the start of its turn.

Kick (Costs 1 Action). Champion Gundyr can make one Kick attack.

Body Slam (Costs 1 Action). Champion Gundyr can make one Body Slam attack.

Halberd (Costs 1 Action). Champion Gundyr can make one Halberd attack.