I played with firebrand, concelhauts parasitic staff and spirit lance throughout PoE1 and had an absolutely fantastic time doing so. This is my idea for deadfire..... (don't have access to beta so your research will be much appreciated).
My idea is to roleplay a 3 man blind PotD run with the three characters that offer firebrand, concelhauts staff and spiritual weapon. Druid, wizard and priest. These will be glass cannons with max strength and high dexterity and intellect.
What I have not decided yet is what and if to multi class them with. My initial idea was to multi class them all