Profundity Event

Please watch videos on how to complete each tier with the correct ships and kill order.  It's very RNG, and mod your pilots.  Hope you saved crystals to do max attempts on Operation Stardust.

Perfectly explained! I’m pretty excited, because I’ve finished up Cassian’s prerequisite and am ready for the next event! The LSTs have helped loads with grinding for the prerequisites.

Always on the last day of the month, every month.  But you won't see the event in your Event table, you need to go to the Journey guide to do the initial unlock battle.  Once you unlock it, then you will see the recurring event monthly