How’s this? A few missions after my first Siren, the Phoenix Point base was attacked. This was my first base attack and who did you think came calling? Yep, two Sirens and many other Pandorans. A couple of mind fraggers in the mix too.
My saving grace was that I recruited a Technician a few weeks ago and not knowing what to do with him, I left him in the base and he slowly leveled up to Level 4. The other coincidence was that one of my researches, which allows the fabrication plant to manufacture turrets, was also completed recently, so I had about 3 turrets to face the onslaught.
One Siren came charging face on, while the other, surprisingly, took a right turn, thinking that she could flank my team. That right corridor was long and by the time she came out to the other end, my team had killed most of the Pandorans. The Phoenix team suffered equally bad damage and the technician became another life saver as he could heal and mend broken limbs. Oh, he could also remove mindfragger with 100% success!
Anyway, that last Siren actually panicked and tried to run away to a dead end. The whole team cornered her and took our time picking at her cherry (head) but before she died, she swiped my assault guy with both of her pincers! He almost died and his last returning shot killed the Siren, ending the game immediately.
This is probably one of my best levels so far, in terms of having great tactics, luck, and a great ending.