Lesser foci battles are not an asymmetrical battle. They are a one-sided battle, with favor given to the 'Spirit' tether. For all the claims that the 'Shadow' tether and 'Vampires' are the main draw of Aetolia, we are constantly given inadequate tools to own up to this claim. However, what tips the balance to a great degree and causes many to simply give up on fighting (despite there being no penalties on loss) and fall into what we can call disappointment fatigue, is the fact that living are able to trigger 'revive' on their fallen.
Without going into the specifics of class mechanics, which is a completely different argument, here is a list of strictly universal advantages the Spirit has over Shadow during a group fight:
1. Instant revive of all members (Since REVIVE does not function for Vampires)
2. Removal of vampires completely (Using 'Eyesigils' or skills. This prevents the use of DEATHLINK and ENTOMB for Praenomen faster recovery.)
3. Spirit Anchor artifact for all members (Does not work for vampires and vampires fighting as another class must wait a 2+ minutes before they can revive. Here is the equation: Time of death until action (EARTHMELD or DIFFUSE MIST) + 2 minute reform cycle + balance lose on RISE(5 seconds) = roughly 130 seconds.)
On the point of instant revives, I've heard someone argue "Just grab the bodies faster than us." Which is as ignorant to the issue and callous a response as I could personally find without trying to come up with it myself. The point is not that bodies can be claimed by the Spirit and revived, it's that Vampires can not do this at all. However, for the sake of argument, if Shadow gathered up all the living faster, yet a person carrying a living body died, that corpse that falls out of their inventory would be revived instantly and now we have an extreme shift in numbers. The living are able to do what movie zombies do: turn the fallen into allies. Kind of a weird shift of tone.
The easiest way to level out this imbalance is to restrict REVIVE to no longer being something that is done while in possession of a Foci Aura or any group oriented combat zone. I would rather that than some aggression timer or other condition.
On the removal of vampires completely using an eye sigil or skill. This seems completely vindictive and only serves a purpose in a world where the Shadow tether had the ability to do similar. Which they do not. Unless there is an ability that acts like Damnation (another spirit ability) that causes a corpse to decay instantly, why does this still exist in the game?
There may have been a time when Vampires revived faster than anyone else, but that time is long since gone. With Spirit_Anchor allowing the living to revive in one minute, this makes Vampires the slowest to revive. Even with DEATHLINK working (which is seldom does), this prevents us from doing that and the timing is still longer than 1 minute.