Unless your NL is hitting like 500k damage + per star on a Triple Throw, the EXP there will be garbage without a party.
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No one, no matter how godly, will want to solo the map. Some mobile small mobbing classes (like Dark Knight, Arch Mage, Blade Master, etc) will have a slight advantage since they can take full use of their mobbing DPS. No one in their right mind would want all mules in the party, especially since the mules would need to leech and couldn't help keep spawn up.