Synchronized Combatant Feat

You have an intuitive understanding of your allies movement, allowing to coordinate perfectly with their actions. You gain the following benefits:

Prerequisite: 4th level Warlord

• Ability Score Increase. Increase your Dexterity, Wisdom, or Charisma by 1.
• Synchronized Movement. Your space is not difficult terrain for your allies, and allies can move into your space to make an attack, but still cannot end their turn within your space (and cannot move into your space if they don't have the movement to move out of it).

Source: KCLL, page 197