Great.
Can I get a crossbow bolt off as I near the tunnel entrance?
It's easy enough to cast light on a stone and block most of it.Okay. Do we have any way to make dim light behind a blind? Once we clear things, we can extinguish everything and set watches with the Darkvision folk.

(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.