Fighter/7th/Captain

Obstinance

Starting from 7th level, while a target is compelled to duel with you, all other creatures have advantage on all saving throws imposed by the compelled target.

Leadership

At 7th level, your convictions can inspire your allies to even greater deeds. Whenever a friendly creature within 30 feet of you makes an attack roll or saving throw, you can expend 1 stamina point to add a d4 bonus die to that roll. The creature must be able to see and understand you to gain this benefit.