They roam solo in the forests in the wildlands. Just check a few forest areas right outside your starter zone. Kite them with bow, easy kill...they will usually shoot one fireball and then try to run up to you and drop their AoE on the ground, just backpedal shooting arrows until he gets close., you will see him start to cast his AoE...sprint out of it and continue backpedal shooting arrows. Usually dies quick in about 7-8 Iron tipped arrows using Basic Longbow.