Their shield is just like they had more life. And it doesn't regenerate when they renew it, seemingly. Unless it does. But biologicals have probably the highest damages potential, and with their 2 basic moves.
Corrosion, and then Destroy-Leading Strike-Destroy-Andsoon...
Just ensure you have 4/4 Integrity (passive), it is the best ability ever, 25 focus every turn for free, makes you able to do this Leading Strike-Destroy-Andsoon... combo.
Kill specialist first, he's annoying. Make sure you don't use break before the AG puts his shield back on, because if it runs out then he puts it on, the whole shield comes back. If it doesn't run out, the shield stays at whatever it was, even if it's broken.
if you want to beat one of them no one els then just wait for it to get down to one turn left i meen that healing move and then break him then attak and repeat it until he dies