Kessens

Kessens
Tactical, Assault, and Volley are purchasable in the training hall. More will be purchasable during your advancement in the game as well as learning different summons. Other than your initial summon pick at the start of the game you will eventually learn all of the other Initial Summons at their alters on Station 24 as a reward for completing the respective quests, and you will learn all of the other the Advanced Summons upon completing the respective gaiden fights.