In 4 cities on 4 different arenas.
We have drome arenas at Thais, Edron, Rathleton and Ankrahmun. At every arena you have NPC which will guide you about items or mount which you can exchange for drome points.
NPC in Rathleton - Fabiana
NPC in Thais - Lorenzo
NPC in Edron - Emilio
NPC in Ankrahmun - Agostina