Arcane Soldier

Spellcasting. The soldier is an 11th-level Eldritch Knight. Its spellcasting ability is Intelligence (spell save DC 15, +7 to hit with spell attacks). The soldier knows the following wizard spells:

Cantrips (at will): Booming Blade, Fire Bolt, Green-Flame Blade

1st level (4 slots): Burning Hands, Ice Knife, Thunderwave, Witch Bolt

2nd level (3 slots): Magic Weapon, Scorching Ray, Shatter, Snilloc’s Snowball Swarm

Multiattack. The soldier makes three longsword attacks.

Longsword. Melee Weapon Attack: +7 to hit, reach 5 ft., one target. Hit: 8 (1d8 + 4) slashing damage, or 9 (1d10 + 4) slashing damage if used with two hands.

Triple Wind Slash (1/day). The soldier moves up to twice its speed without provoking opportunity attacks then uses its multiattack. The first attack that hits as part of this multiattack deals an additional 4 (1d8) force damage.

Arcane Strike. When the soldier hits a creature with an attack as part of its multiattack, it can use a bonus action to impose disadvantage on the next saving throw the target makes against a spell the soldier casts before the end of the soldier’s next turn.

Plunging Strike (Recharge 5-6). After taking the dash action, the soldier can make a longsword attack as a bonus action.

Raise Shield. The soldier raises its shield and gives itself a +3 bonus to its AC against the next attack that would otherwise hit it before the start of its next turn.

War Magic. When the soldier casts a cantrip as an action, it can make a longsword attack as a bonus action.

Vacuum Wave. When the soldier is targeted by an attack from a creature it can see within 40 feet of itself, the soldier can make a magical pre-emptive strike against its attacker. The attacker must make a DC 15 Constitution saving throw, taking 16 (3d10) thunder damage on a failed save or half as much damage on a successful one. If this reduces the target to 0 hit points, it cannot complete its attack.