Next artifact or skill for Magi

Vyretre

I'm a Magi with my class skills and survival up to transcendent and weaponry up to party. What skill or artifact should I be trying to get next?

Kasa

Avoidance is very good, so is the rest of weaponry for a variety of reasons, and Riding defensively. After that, I would get Vision and philosophy, and then get some artefacts: shield of absorption, sip rings, bracelets, diadem, and some other fun defensive stuff.

Antonius

Avoidance is always good for the damage reduction for both PvP and PvE, plus the ability to dodge in PvP. I'd say do that next.

Austere

If your intention is hunting, I would get SoA then avoidance.  If your intention is combat,  I would get SoA then avoidance.  Though learning some abilities to less than trans is useful.  For instance, learning to squint in vision will save you a lot of headache (this is one of my first investments on alts), or learning tattoos to starburst. Keep in mind, learning tattoos opens more tattoo slots at specific ranks.  I would learn weaponry to targeting for a combat, it will reduce the number of aliases you need by a long shot.