Upgrading 71+ spellsFollow

There are 3 ranks to each spell 71-75, as you've probably figured out already. The rank 1 spells are all vendor bought. The rank 2 spells are upgrades of the rank 1's (naturally) and are dropped off of one groupable mobs. I haven't seen any info yet on what mobs drop them yet. The rank 3 spells drop off of raid level mobs. When you memorize a higher rank spell it automatically replaces the lower rank one in your spell book, spell gems and saved spell sets.