The assumption here is that the benefit of Serena's aura at full strength outweighs the penalty of being further away from one's soul gem meter by meter in percentage effect. Given Serena would have be standing within 100 meters of the beholder for this plan to be viable, likely closer than that, even her aura at full strength will be reduced in effectiveness.
I'm not 100% sure what you mean here. If you're talking about needing to be within 100 meters of the Beholder in order to support melee Veterans, then I'd counter by saying that I would prefer to rely on
ranged attacks as much as possible. Or are you saying that the girls are generally going to be closer to Serena than they are to the Beholder
anyway, so it wouldn't provide much more benefit to be
right next to her? I'm waiting on inverted_helix for the verdict on that one.
Given Serena will not be able to hold something like twenty-plus soul gems without a container, likely a sealed container to keep them from falling all over the ground, their combat effectiveness will be further reduced, and much more seriously than merely holding their gems away from them would.
Containers don't reduce effectiveness (AFAIK). The thing that reduces effectiveness is the fact that the gems are not touching the body.
This isn't even accounting for the issues inherent in a demon being able to notice that all the girls souls are in Serena's arms (their sensory abilities are naturally higher than meguca, you can't assume they aren't able to do this until we're proven otherwise), and focus firing on her until she trips up.
They're going to notice that she's the one generating the Aura, so she's going to be Priority Target #1 regardless.
This isn't even accounting for Serena needing to mentally keep track of twenty plus girls so she doesn't accidentally kill one of them herself by disconnecting their body, and those same twenty plus girls having to keep track of Serena in the heat of combat lest they kill themselves.
This is an issue, to be sure, but 100m is a fairly long distance. I'd say that the bigger risk here would not be accidental disconnection, but rather that the girls will have a tendency to clump together and stay
too close to Serena. So they would be more likely to be hit. But I'd still say that the benefits outweigh this risk (as long as their combat effectiveness isn't hurt
too much by not having their gems on them).
This is the equivalent of spooling out an unbreakable string from one particular person in a combat situation, and tying it around every other soldier's neck. There are so many tactical issues with that plan that any benefit that could be gained would be immediately drowned out by the coordination issues it would create instead.
String isn't a very good analogy, because there isn't a physical connection that could get snagged on anything. And 100m is a fairly long distance. But yes, there definitely are tactical issues. I want to spend a good chunk of time training to fight the Beholder, and that is one of thing that I would want them to work on. Heck, even if we
don't decide to use this tactic, it would still be good to train our Veterans to fight when they aren't carrying their own soul gem because that would be a reasonable approximation of the reduced combat effectiveness that would occur due to fighting inside a miasma.