1. Magic2. Channel/magic set and phys def/reduction set if you want to try hard3. Def level, Attack level, purify
1. Get magic first, but vitality comes in handy especially for a speed boost. Extra physical damage reduction for a demon mystic (if that's the route you are going) is nice to have.2. Yes all three. Usually a lot of sages go with magic because they already have extra defense and puri heals. Majority of people go solely channel, its nice to have short cool down on absorb soul ... because op of course .3. Channeling weapon (150 lvl dragon one) is my preferred > purify > atck > def.
dont play mystic its bad lol sin is only skilled class in game
Use both tomes. Switch them depending on what your PK circumstances are. Get a puri wep. Camp it like a bastard.Make sure your gear has very good channeling. Spam pets, spam heals, spark, spam absorb soul, GG.