User blog comment:Mich, Michele & Kuhla/Future Units Preview/@comment-26846453-20160129204143/@comment-27109417-20160130031151

Same thought here. Those units are by far, the most overpowered free-to-get 6 stars that I have ever seen. They can probably be on par with some 7 stars and definitely outclasses some rare summon 6 star units. With units like these, I expect the vortex dungeon to be really hard...