QUOTE (Ascalaphus @ Dec 21 2010, 02:53 AM)
Well, radar and ultrasound would have some minor advantages compared to astral sight; not having to spend an action to activate, and no penalties for interacting with the physical world, mostly.
Still, I don't think that's all that overpowered; you're paying Essence after all. As long as you insist that even radar won't let you spellcast through walls, I think it wouldn't really make such a big difference to let mages cast with radar/ultrasound. Radar and ultrasound still impose some visibility penalties after all.
QUOTE (Stahlseele @ Dec 21 2010, 02:39 PM)
It
is
better
when
you
want
to look
through
stuff
NOTHING ELSE IN THE BOOKS ALLOWS THIS!
You should read more carefully. If you forbid spellcasting through walls, is radar really OP compared to thermographic? I don't really see why. And that's certainly not an argument against ultrasound, because ultrasound doesn't let you see through walls in the first place. The power difference is really pretty niche.