Fuchsia told you there's a potion which could allow you to master Krallic instantly. She explained that the Shugos possessed such potions, and advised you to talk with Kunberunerk. Kunberunerk said that Marmeia, the Krall language expert, had the potion and advised you to meet her. Delighted to have a volunteer willing to test the potion, which hadn’t been tried by a non-Shugo before, Marmeia gave you the potion.