The answer to your first question is - the shield buff stays with the Sorcerer as they move. It only affects the Sorcerer; it is not a 'friendly effect' aura (just the caster).
Mutated aura color is perfect and I refuse to change it. We do not have enough green. I am investing all of my designs in "green" from now on. No cap.
Artifacts follow a level differential pattern that has been in place since the event was created :-)
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