User blog comment:Kushieda minori/Game Update note May 10, 2016/@comment-25474140-20160511085640

Castle 11, for that cost I dont see huge benefit when you are near/at level cap. 20% extra def/att is not worth it too.

Elemental lab, well resource price is more geared towards people with maxed all buildings so they can burn res, 9L for Orb is not that bad too.. but cost. Will just wait for 50% off on it.