I heard that:

-A full group of Lv30 3* or better is 'recommended' for this event, though I'm assuming the first half is a bit easier.
-The developers decided to stop trying to make the standard events difficult at some point, so only the first handful of events might make it hard to max out characters.
-This event's knight, Lavender, is considered to be the game's only non-skippable must-have event character. I'm assuming that's because of the 3x tile heal during subjugation ability.
-The DMM version has revivals of old events, periodic revivals of this one.

Does anyone know whether the phase 1 maps are still going to be available once phase 2 starts?

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^^ *And that there link just came out of nowhere - odd forum feature to change words links without warning ...