This is a mod for BG:EE, BG2:EE, IWD:EE, and EET. It adds over 150 new spells to the game, including spells that let you fly or move through walls. Many of the new spells require EEex, so I recommend you install that first if you are on Windows.
Updated by me to allow Olvynspells to partially work with 2.6+EEex, so as to be equivalent to Olvynspells without EEex.