To put things in context, ranked placements are capped at Ascendant 1. If you think about it, that is where all the Radiant/High Immortal players will be placed. THEREFORE, you should expect yourself to be placed TWO Ranks down. If Radiant is Asc, then Asc would be Plat, et cetera.

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On top of all this, your MMR should still be the same (maybe a bit lower) than where you were. In other words, if you check the players in your lobbies they should all roughly have the same rank as you did last act!