AD&D 2nd Edition

Range: 0
Components: V
Duration: Special
Area of Effect: Special
Casting Time: 2
Saving Throw: None

By use of an extension I spell, the wizard prolongs the duration of a previously cast 1st-, 2nd-, or 3rd-level spell by 50%. Thus, a levitation spell can be made to function 15 minutes/level, a hold person spell made to work for 3 rounds/level, etc. Naturally, the spell affects only spells that have durations. This spell must be cast immediately after the spell to be extended, either by the original caster or another wizard. If a complete round or more elapses, the extension fails and is wasted.