I am a necro (king of needing very little to be happy) But in terms of groups - no group survives without heals (Cleric is best at this - especially end game) and every single caster wants crack - not only do they want it but more mana = more pulls = more xp = everybody wins.
Of course tanks are the side of the holy trinity everyone needs also, but being new is hard because they are super gear dependent.
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