Invisibility

Invisibility, first appearing in Ultima V named under its incantation, Sanct Lor, is an illusory spell that bends the path of light to render its caster or another target visually indiscernible over a short duration, for the purpose of evading detection. During the Age of Armageddon, it also produces a serendipitous effect in greatly enhancing one's perception of poorly-lit environments. The enchantment is limited to affecting a single person; its greater variant, Invisible All, broadens the clandestine properties to benefit an entire group.

Black potions and invisibility rings fulfill the same purpose as the spell.

The effects of Invisibility are ably negated by its antithesis, Reveal.

In Ultima IX, this spell keeps the caster invisible until either mana is used up or the spell is cancelled.

Lore