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from a player post
Races: 300 sc each
classes: 750 sc each
Rk2 spells : 750 to unlock all your rk2 spells (character specific, not account wide; do not see a rk3 version)
AA cap increase: 250SC per 100 AA (character specific, not account wide)
Inventory slot increase: 250 sc per slot (character specific, not account wide)
task cap increase: 100sc for 5 tasks
That is all I see.
NO prestige item unlockers, NO shared bank unlocker, NO journeyman merc unlocker