Mystic Dexxer hybrids work best with melee weapon skills, specifically Mace Fighting, as you can reach the swing cap with a decent weapon while in Stone Form. Throwing would be too slow for a Mystic.
I currently run:
120 Throwing
120 Tactics
120 Bushido
120 Anatomy
100 Necro
70 Chiv
70 SS
Basically a sampire, that can also use Wraith Form/Curse Weapon.
Although a Thrower can do all of the encounters you listed a melee temp is better.
I'd suggest:
120 Mace
120 Myst
120 Focus
100 Tactics
100 Anatomy
90 Healing
70 Chivalry
Work out the penalties/bonuses for Stone Form so you can plan your suit properly, it's easy to Imbue it to be a full dexxer with 100 LRC on there too. Play in Protection. If you can boost skills with items do, but it isn't necessary. Don't use Refinements as they don't work with Stone Form, regardless of whether you use them for resists or DCI. Stone Form will mean that you can't be Cursed (have your stats lowered) which means if you plan your suit properly you will never have less than 140 Dex which means you will bandage at the fastest it's possible to. Stone Form also means you can't be poisoned which means your bandages can't get blocked. You don't need to use Spell Channel weapons because Mysticism's Enchant Spell will add Sc-1 and 60 Hit Spell to your weapon (you can choose which spell, if you're fighting anything that counter attacks - which is everything you listed - then use Dispel and it won't trigger additional counters). I built the template years ago for soloing Slasher of the Veils. You can supplement your healing with Cleansing Wind with another on Spell Trigger, and Healing Stone/potions if you forego a shield's mods.
