It took a lot of money and Arcana Coins lol. Wanted to speed it up.
As for Sparks of Battle. Is it really a 100% drop on the 4th chest?
Woo~
I've never not gotten the 4th chest, but be warned - it may actually be faster to level up there but it FEELS soooooo slooooooow... I just miss the sense of actually making progress by actually getting higher level enhancers, lol