The labyrinth set is, sorry, ABSURD. Let's use the eclipse set as benchmark. Per hit, you'll receive 5% HP damage with eclipse, but 2.5% HP damage with labyrinth (in expectation). On Top of this labyrinth, with 25% chance when struck, inflicts debuffs on ALL of the opposing characters. Further, eclipse provides a buff that can be removed, while labyrinth is a passive. Let's top this of by acknowledging it a 5 set, so we can add a cosmic talisman which is probably stupendously powerful once maxed out. Guys seriously ? This ain't no power creep, this is a power rush.
The sentinel 5 set looks like equally bad news, I don't even want to think about that.
/e: It'd be nice if we, the players, could agree on not using these things ... I don't even want to think about what toons and talismans that are being released in a year from now are going to be capable of. 10% chance to permanently delete enemy toons from the opponent players roster ? The idea of introducing balanced stuff instead of game breaking stuff seems to be completely absent from the dev's minds.