The play styles between a mystic and a priest are very different. One main difference is that a mystic is or at least should always be out of combat, since their core support skills don't put them in combat. (Corruption ring soon). A great priest uses triple nemesis, and thus should always be in combat. However, there is a glyph that gives them increased movement speed in combat.
Another difference is that mystics do have less healing and defensive support than a priest (Healing Immersion, Kaia's Shield, Arise, MUCH faster resurrection, etc). This is what allows them to carry trap parties much better than a mystic can.
However, to make up for this, mystics do have more offensive support than a priest, especially since priest buffs can still be used while on a mystic. Mystics have auras that restore 20 mana every second, increase crit rate by 2.1x your base crit, and provide 40 power and 6 attack speed to those within 30m from the mystic. (Energy Stars still provide more attack speed and perhaps more power if they use the effect increase glyph on energy stars.) Mystics also have Contagion they can use every 2 minutes (Or less depending on CDR). They will be able to use more thralls and provide more mana to the party than they currently can, and get increased healing on motes. (Although not sure if vengeance still gets one-shot or not with a future update.) Motes will definitely be more spammable with the lower CD, and could be thrown up to 18m away (It uses gunner's stun bomb/turret physics, so actual 'real' physics).
These were specifically QoL changes to Mystics so you should view them in a similar manner. Even without these future changes, though, mystics were preferred for speed runs since for a speed run you needed to be already familiar with the dungeon, and thus would require less defensive support.
The question, though, is what is the perfect balance between defensive support vs offensive support?
Look at this thread for more on this topic, and see that priests are definitely still viable. (Ignore the title, though.)
Edited by: DivineRemnant
almost 2 years ago