I think it's good to make groups stronger than solo. I currently don't have many people to group with and when I do find someone they are usually weaker so the bonus rewards are nice. I think even if solo was double co-op I would still want to group, but then nobody else would...
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Arcane Orb(Frozen Orb)
Slow Time(Point of No Return)
Mirror Image(Extension of Will)
Magic Weapon(Force Weapon)
Storm Armor(Power of the Storm)
Blur
Cold Blooded
Astral Presence