Jonstal's improved double wizardry

Jonstal's double wizardry was an arcane alteration spell that allowed a wizard to cast the spells fly and non-detection simultaneously.

Effects
The caster had to have memorized all three spells and not have cast either fly or non-detection before casting Jonstal's improved double wizardry (unless the wizard had those spells memorized more than once).

Once activated, both fly and non-detection took effect immediately on either the caster or a touched recipient.

Components
Jonstal's improved double wizardry itself had only a verbal component, but the material components for both fly and non-detection were used as well.

History
This spell was invented by the archmage, Jonstal. Despite much research, Jonstal was only ever able to pair these two spells and two other spells. The other two spells were cast using Jonstal's double wizardry. To his credit, the only other being known to be able to cast two spells at once was Azuth himself.

During one of their many spell-sharing sessions, Elminster shared this spell with the wizards Mordenkainen of Oerth and Dalamar of Krynn.