Dragon's Nest is even easier if you place a Pirate by the closest Ranged spot to the spawn point, it's like a safety measure if you have doubts your duelist by the mid of the rushes, but even so not needed at all.

I do have a doubt with the 90/12 map, two soldiers is the ideal because of the UP generation (Aria and Katie are a plus) but I wonder if replacing Phyllis with say Shuka? -2 to all costs after she's placed, can help take down the early mobs easily far easier, the only bad point between Phyllis and Shuka is cost, but still I think Shuka has the stats to handle those rushes far more easier than Phyllis.