Camera and movement controls, which are notoriously difficult to tune to the satisfaction of a wide assortment of players. There are some genuine balance bugs, but we've noticed a lot of those already. D&D has a lot of ROOLZ, so there's a lot of stuff that can be broken/poorly balanced/wrong. The toolset also needs some fixes simply for ease of use, which has been a big complaint for many people.
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Your honesty is appriciated. Thank you.