After you get 4 members in your party and you begin to recruit members for your ship a new option will be enabled in hand to hand combat. This option will be "Crew Sp." and it will appear right above "Items" in the command screen, for it to appear you will have to max out your spirit points, once you do that choose that command, 2 attacks appear, both attacks drain ALL your spirit points.

Prophecy:Causes damage to all enemies on screen.

Blue Rogues: Damage will vary depending on how many crew members you have,if you have them all it causes around 2,000 damage to all enemies and heals all party members.