Invisira
From Final Fantasy Wiki
Invisira (インビア Inbia), also known as INV2 in the Famicom release and Invis2 in the Origins release, is a level 6 White Magic spell which increases the Evasion of all allies by 40 points.
The spell can be bought at Crescent Lake and can be learnt by the White Mage, White Wizard, and Red Wizard Job classes. In the Dawn of Souls and 20th Anniversary Edition releases it costs 20 MP to cast.
