As opposed to a pure will incarnation, using believers' bodies as a medium to transmit their will is another way for deities to create avatars in the main plane.
The better the medium's body, the closer the avatar's strength will be to the deity's true body.
Of course, even if they're willing to inject a part of their godhead, there will still be a limit in strength, regardless of how close it is to the deity's true body.
However, overall, it's definitely a higher level than a simple will incarnation.
Since the Mother of Evil Dragons and the others have appeared before him once more, it's clear that a battle is inevitable.
But do they think that they can handle him just by changing from a will incarnation to a closer medium?
Moreover, it seems that someone is missing. Otto could not find the trace of the Shadow Lord here.
So, do they think that just changing their physical form would be enough to deal with him?