Wall of Iron

Level 7 priest spell · Invocation/Evocation

Sphere: Elemental Earth
Range: 5 yds./level
Components: V, S, M
Casting time: 5
Duration: Permanent
Area of effect: 15 sq. ft./level or special
Saving throw: None

Reputed to be granted by some dwarven deities as a 7th level spell: otherwise, identical to the 5th level wizard spell.

Sources

Priest's Spell Compendium Vol 3

This spell on the AD&D 2nd Edition Wiki