Mana Zone(Darkness)

You can keep your enemies at bay that enter your mana zone. If you have the Alert Feat and Blind Fighting Fighting Style, anyone who enters your mana zone is in danger. You gain the following benefits:

• While you are wielding a Longsword, other creatures provoke an opportunity attack from you when they enter your reach
• You gain a +1 bonus to AC while you are wielding a Longsword. You must not be wielding a separate weapon in your off hand or a shield. However, you can apply this bonus while gripping the Longsword with two hands using the versatile feature.
• When a creature tries to flee your mana zone, the Attack of Opportunity has Advantage