Pretty straight forward question. Can I 6 box and have a cleric Merc? I want to level a cleric but I would rather pay the merc fees than be worried about constantly needing to heal. The current combo is SK, Pally, Necro, Cleric, Enc, Mage.
Not sure if I am understanding your question correctly, but If you mean, "can I run 6 accounts, and have a Cleric merc out on one of the accounts" the answer is Yes. But the Mercenary will always be in the group with the account that controls it, so it cant sit "outside" of the group healing without gaining exp. This would mean you would have 7 group members and only 6 spaces in the group.