((Bastard, now you've made me have to fast forward my plot point))

Vahlens lab, Where the...

The male's psiblocker quite literally broke it's self, and his eyes lit up. Not the usual orange but a sickly green as the blades coming for him were destroyed.
"Who. Are. You." It hissed, the stench of death and decay on it's breath, sickly green gas emitting from it's mouth as it spoke "You provided this, but you are not one of them, nor are you one of the ones before them. You are new..." He turned his head to the destroyed children "You are dark enough to be them, but you are not them, you are... you reek... Who! Are! You!" It's voice got more angry, as if enraged by being in the location far away from where it was supposed to be. Fires erupted around it as the doors of the room closed and locked themselves, parts of the roof cracking "And my soldiers have been executed by you
He paused for a few moments. This was not correct. They wouldn't He let out a sickening laughter "Eons in the earth, locked away. They break open my chamber and release me, and you provide the solution to all my problems." The being folded it's arms "And now you will tell me where they are" It said as it's eyes intensified, giving a dark laughter once again

Tyranids

"Oh no? This world has a fail safe, if I give the order it will explode and destroy all your forces on the planet and quite possibly a portion of your fleet. A full stream Dark Energy to the planets core. Nasty results when those mix together. Still so confident that you want to try and take the world? Overwatch, prepare Endgame for this world"
"Cannot comply, Endgame already prepared." The AI reported, and there was a voice over from the Overwatch program running in the same room as the former overseer.
"Endgame already prepared" The Spectre leant towards the screen
"Final chance. Leave now and never come back. If you want to gamble with it, don't blame us when it all goes boom" He warned with a smug smile on his face "We've given you the location of a more worthwhile meal, are you really going to waste your time on the scraps we have here?"