Step 1: Buy summoning sacks, the one with bosses from mano (weakest) to snowman (strongest). Step 2: Go to an empty spot and open sacks -proceed to kill bosses. Step 3. Loot coupons. The reason this works is that one of the specific sacks summons multiple bosses, and each boss drops up to 5 coupons (Have not seen more.) So with 5 bosses (6?) that's 25 coupons plus some nx cards and items dropped. You basically fully make your meso back by doing this.
Well... I don't know how it happened, but someone summoned this specific sack in henesys, and I got 15 envelopes from it, I assume that sack bosses drop more envelopes than regular bosses??? Edit: I can test and upload video if anyone requests.
I tested and sack dropped 6 total envelopes, and 800 nx in cards. Looks like you were right, I must have had envelopes from before in inventory and gotten confused... but you can still hunt bosses for envelopes where they usually spawn for free.
thanks for trying it... new guide 1.-make a 4th job mage 2.-spam aoe where theres a lot of mobs and u can 1 hit