Delayed activation is the only part of a hand grenade we don't see in the books and hand grenades are so obviously useful in so many different situations that I can't image they have never occurred to any Arcanan in the last few centuries.
Nicholas
PeterZ wrote:...snipped...
I seem to recall spells can be carried through a portal and be activated once past the barrier. Why haven't such weapons been produced? Why was that idiot Thalmayr so oblivious to the possibility that something could be hurled through the portal and "detonated/activated" once past the portal?
There are just too many gaps between the observed responses of the Arcanan military and what appears to be possible. That suggests that there are limits to how magic can be applied to both everyday activities and fighting war.