Phantasmal force

The phantasmal force spell creates the illusion of any object, creature, or force. The illusion is visual and affects all believing creatures that view it. It does not create sound, smell, or temperature. Effects that depend on these senses usually fail. The illusion lasts until struck by an opponent -- unless the spellcaster causes the illusion to react appropriately -- or until the wizard ceases concentration upon the spell. Creatures that disbelieve the illusion see it for what it is and may be able to convince their associates if this knowledge can be communicated effectively. Creatures believing the illusion are subject to its effects. The illusionary effect can be moved by the caster.

Note: This spell originally appeared in this form 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.