Originally Posted by dby2k

It's not a summon lolz. It's an AoE buff skill that affects summons in the area and can be learnt when the summoner reaches level 45. Also known as the super version of Lesson start (whip).
Most magic type summoners don't really pump this, due to lack of SP but normal type summoners max it usually, as it gives Cassilas incredible stats, move speed and attack speed. It also stacks on top of ancient memory so your magic type summons deal a great damage boost with it.