AD&D druids. They're not that great in dungeons are they. Not many plants around. Even less fluffy animal friends. But what about if there was an alternative druid class which specialised in subterranean locales?
This is the notion I am running with here.
The rest of this post is designated Open Gaming Content according to the Open Gaming License.
Glowing Fungi of Labyrinthine Guidance
Level: Druid 1
Duration: 2 turns per level
Upon uttering this incantation, the druid's left hand (or a small pouch on his person) fills with a delightful collection of small glowing mushrooms. The glow of the fungi is a pale green, and is less than the light of a candle, but is enough to be able to spot them from a distance of 30'. Typically the mushrooms are dropped one by one and used to mark a path which the druid desires to later retrace. Indeed, while the spell lasts the supply of mushrooms in the druid's hand (or pouch) will continually replenish, ensuring there are always enough available for use.
The glowing mushrooms created by this spell have one further special property: they appear completely innocuous to dungeon denizens, blending into the natural environment and not causing a single monstrous eyebrow to be raised if encountered.
Eye of the Underworld
Level: Druid 1
Duration: 1 hour per level
The recipient of this spell gains the ability to see in complete darkness for the duration. This is not some newfangled thermo-vision, it's the real deal -- 100% 20/20 vision in the deep darks of the underworld as if it was broad daylight.
As the druid increases in level he can bestow this optical blessing on more friends -- one target per three levels of experience.