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I'm curious as to the exact type of grenades you were using in your first encounter: standard HE? or HE Packs? did you try alien grenades, stun grenades (from stun bomb conversion) or flashbangs (the improved flashbangs are pretty strong and may be able to do it)?
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Normal buyable grenades and alien ones - pretty much 1:1 ratio, and HE only (no packs with blaster bombs). I have not yet researched any stun mechanics beyond zapper (and probably wont be using flashbangs or stun grenades as they are too easy to deliver, unlike the small launcher where you need to hit perfectly or have obstacle behind target close enough)
What was really dishearting was that laser try next time around, I had that one heavy laser and few laser pistols and it didnt go well too.
Also, funny sidenote : when trying to find the sectopods attributes, i bumped into article on
UFOPaedia which ended with
Now you can go back to having nightmares about Sectopods
and I was like : What ? WHAT ?!