For the passive feature only available to githyanki NPCs, see 
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War Magic is a Eldritch Knight Fighter passive feature. This allows the Fighter to make an attack after using a Cantrip by using a Bonus Action.
Description
You have honed your body and magic for war. After you cast a cantrip, you can make a weapon attack using a 
Bonus action.
How to learn
Classes:
- Class level 7: Eldritch Knight
Notes
- The attack granted as a bonus action via this feature, does not activate Extra Attack.