Originally Posted by
Cinco
TLDR; We've updated the event dungeon to support full parties.
Details: Restricting to 'solo only' would definitely keep these vanities quite rare - but the main reason we set it up this way was based on available development time. Originally it seemed like the we would not have enough time to properly balance a new event level that allowed players to run ghost party / solo and in full groups at all levels. Fortunately things have changed! OP has been edited (to remove reference to 'solo only'). Best wishes!
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