SKILL GEM ORDER (starting from the first uncut for defeating Miller)
Tier 1:
Frost Bomb >
Contagion (get this from the abandoned stash in Clearfell)
Tier 3:
Essence Drain >
Shield Charge (important to get with a tier 3 gem for stat requirements, can also skip if not interested in using for mobility)
Tier 5:
Bonestorm (replaces
Frost Bomb for extra single target)
SPIRIT GEM
Withering Presence
SUPPORT GEM ORDER (it is entirely possible you will not get all of these in Act 1)
Magnified Area I for
Contagion
Unleash for
Contagion
Swift Affliction for
Essence Drain
Scattershot & Arcane Tempo, both for
Bonestorm
Zenith for
Essence Drain (can be annoying to use, need to be >90% mana when the ED hits the target) OR Chain for ED if you feel damage is fine/want easier clear.
Persistence for
Withering Presence