Continual light

The continual light spell creates light that as bright as full daylight in a 60-foot radius, and lasts until negated magically. It can be cast into the air, onto an object, or at a creature. When cast at a creature, it may become temporarily blinded. If the spell is cast on a small object that is then placed in a light-proof covering, the spell's effects are blocked until the covering is removed.

A continual light brought into an area of magical darkness (or vice versa) is temporarily negated so that the otherwise prevailing light conditions exist in the overlapping areas of effect. A direct casting of continual light against a similar or weaker magical darkness cancels both.

This spell eventually consumes the material it is cast upon, but the process takes far longer than the time in the typical campaign. Extremely hard and expensive materials can last hundreds or even thousands of years.

The reverse spell, continual darkness, causes complete absence of light (pitch blackness), similar to the darkness spell but of greater duration and area.

Note: This version of continual light originally appeared in the 2nd Edition Player's Handbook for Advanced Dungeons & Dragons from TSR. Its use here is for the purposes of providing context for the campaign only.