Although you can solo the dungeons, " provided your equiped with the best for your lvl ", its a lot better and easier to go with a small group. This makes it faster, and the larger the group, the higher the crits, earning you a lot more xp and coin and even some nice items you cant find elsewhere. With a group you also get far more bonus xp and coin for completing the task than you normally would. These task master dungeons are the best and fastest means to lvl there is outside higher lvl chars pl,ing you.