Spear moves should be similar to the current warrior ones but Dex based. A large AoE attack, A half damage AoE trip attack, a run through enemies attack, an armor piercing stance, an extra long reach attack and a vault in and vault out again attack would be my suggestions.
https://www.youtube.com/watch?v=tOUksDJCijw&feature=player_detailpage#t=1659 is how one RPG does spear specialism.
