Spellcasting. Weston is a 9th-level spellcaster. His spellcasting modifier is Charisma (spell save DC 16, +8 to hit with spell attacks). Weston knows and can cast the following spells:

Cantrips (at will): blade ward, vicious mockery
1st level (4 slots): charm person, sleep, true strike
2nd level (3 slots): invisibility, calm emotions, detect thoughts
3rd level (3 slots): dispel magic,nondetection
4th level (3 slots): polymorph,dimension door
5th level (1 slot): scrying

Force of Personality. Each turn Weston can cast Command as a bonus action, without expending a spell slot.

Rapier. Melee Weapon Attack: +7 to hit, reach 5 ft., 1 target. Hit: 8 (1d8 + 3) piercing damage. 

Fleche (Recharge 5-6). Weston makes a special Rapier attack against a target, lunging for a vital weak point. On hit, instead of taking the attack's damage, the target must make a DC 16 Constitution saving throw; on hit, the target takes 4d8 piercing damage and is stunned until Weston's next turn. On failure, the target takes half damage and is not stunned.