thrud -- I have no problem with researching and learning a Nether Bolt attack for the Dark Channels list. That isn't the issue.
The issue is making an
instantaneous OB attack spell. As Dark Schneider points out, this gives a tremendous advantage to the caster of such a spell. So huge an advantage that no other caster can stand up to it.
First action every round? Nether Bolt nearest target.
It is a game changer. The casting times are one of the few balancing factors available, since there is little that can be done against bolt spells except hope that you don't get hit.
My previous comment about an elemental spell "messing up the appearance" of the list was in reaction to YOUR comment about having a non-instantaneous spell on the list (and note: that list DOES have a non-instantaneous spell on it already) messing up the "appearance" of the list.
Side Note: Nether is not described in RM books as being a force of desctructiveness. It is described as being a force of nothingness