I love me a good crossover event, and honestly "Stranger of Paradise" feels like kind of a perfect fit for one.
In particular, it would be cool to have a chance at grabbing some iconic weapons, or even armor sets. Specifically, I would LOVE the opportunity get Garland's armor for my Dark Knight. We already have a Warrior of Light set via Labyrinth of the Ancients, but potentially a revamped version of it, or at least matching weapons, for Paladins?
Truth the told, I've not had an opportunity to play through the game yet (was waiting until I upgraded my PC), but if any other rewards come to mind, certainly shout them out!