((1. Everything that can be said about the Tyranid has pretty much been said. Hyper-intelligent dinosaur things which tailor their sub-species specifically to what they're trying to kill at the time, from massive four-armed Tank-Killer Carnifexes to mass swarms of small leech-shooting termagaunts, to self-disguising interbreeding Genestealers. The 'threat' is actually an incomprehensibly large mass of Tyranid 'ships' from outside the galaxy, and all of the 'Hive Fleets' entering the galaxy are (comparatively) tiny tendrils which basically punch through solar systems at a time.
The only instances I really remember of a tendril being stopped (Both by the Imperium of Man) is the DoWII (Game) one, where they basically had to wait for it to take over and begin consuming their homeworld, and then come back on a suicide misison, drop on the world and inject the massive prehensile tendrils sprouting from the ground with a type of poison to try and corrupt their pool of biomass. It worked, but plot-wise it was a bit of a stretch- Meanwhile the second was Macragge, which was basically the second most fortified planet in the known galaxy, and they had 90% of their army stay and take massive losses whilst their elite company beamed into the hivemind itself in order to take complete losses, and kill it.
Only issue is, the 'Hiveminds' are one per fleet, which again is a comparatively tiny part of the whole Tyranid force.
... That went a lot longer than i expected. Enjoy your 2 min requisite sci-fi education.
tl;dr, The Zerg on crack
2. Has anybody asked Steve how the battle at Hephaestus ended? or even the Altered war?
3. Hey, ME3, you beat two reapers, one via sandworm, the other via nuclear payload delivered from orbit - in what we assume is a direct encounter.
4. I feel you bro.
Sorry if we're sidelining this discussion too much.))