Torches for Sale!

[Turtle]

You're right - that's an omission from Book II. There needs to me something like a Gravedigger's Flame Amulet or a Gravedigger's Flame Hat in the game...

More awesome yet would be an Amulet of Predator Sight.

Probably too awesome.

[Evnissyen]

I'd vote for a "darkness" spell in Book III for just these kinds of situations.

Or, maybe, a kind of "Pigpen" spell (you know, from Peanuts) . . . by which means you engender this sort of persistent though temporary cloud of blinding dirt that extends several squares in all directions... .