Great combo is Apocalypse and Necrovisual Symbiosis
Still 24" from Valpy, though, right? It's just for the LOS?
Yes, of course... 24" from Valpurgius, but LOS gives target of Necrovisual Symbiosis spell.
The Channeler may view the world through the eyes of the target and see everything he sees...
It`s usefull for very close terrains, canals... Valp can cast apocalypse round the corner if target of Nec. symb. can see that point.