Source: Unearthed Arcana 81 - Heroes of Krynn

Prerequisite: 4th Level, Squire of Solamnia Feat

You are a Knight of Solamnia aligned with the Order of the Crown, a group that extols the virtues of cooperation, loyalty, and obedience. You excel in group combat and gain these benefits:

• Ability Score Increase. Increase your Strength or Dexterity score by 1, to a maximum of 20.

• Tactical Teamwork. When a creature you can see within 30 feet of you makes an attack roll against another creature that is within 5 feet of you, you can use your reaction to grant advantage on the attack roll. You can use this reaction a number of times equal to your proficiency bonus, and you regain all expended uses when you finish a long rest.