As far as I'm aware, Shrine of Slumber hasn't appeared in any T3 Stratums since Beta, so ??? Although the Sloom's spikes make it looks more like it belongs in T2 than T3. Has SoS appeared in T2 recently as well or something?
Also, if you look at the 2nd picture of the Sloom, you can see the tiles beneath it do not match the ground in Shrine of Slumber. Are these from new Scenario Rooms or something?
Just looking for a little clarification about what's going on, if any of you guys know about this.
They be old images, just re-uploaded recently by a few users :P
Shrine of Slumber hasn't appeared in any tier since the closed preview event except for the booch that made its way into the arcade, and that was in T1. It looks like whoever uploaded the T3 version of the Sloom only did it just so we could have an image for the visual encyclopedia. During the preview there wasn't a third version of the Sloom. Pretty sure the T2 and T3 Slooms shared the same appearance, though if someone from the preview could refresh my memory that'd be great too.
The second picture is the Sloombargo, the larger version of the Sloom, just like we have a larger version of the spiky Toxigels. What you see under the Sloombargo is its sleep mist which it oozes out wherever it goes.
So yeah, apart from the weird bug/glitch where the Shrine of Slumber appeared in Tier 1, the levels and respective monsters haven't appeared since preview.