well Unless otherwise stated all abilities do spell type damage. and inversely any boost from auto attacks will do bonus physical type damage. examples of these include Maievs blade dance talent which causes fan of knives to deal physical damage around Maiev and Varians Heroic Strike trait dealing Spell damage in stead of physical which fun fact at his launch did physical damage but it made twinblades builds way too strong with his second wind talent.
That brawl was fantastic and terrifying at the same time.