Are Rock Jellies pretty common in T3? 'cause I just found three in the same level.
Rock jellies. Before I hit T3 I had only ever HEARD of the things. Nobody seemed to know anything about them, except for telling me they supposedly spawned in place of stone blocks.
Well, I finally completed my set of 4* gear and jumped into a T3 dungeon, one of those Cravat Hall type of levels, with an undead theme.. this one specifically was called something "Gallery".
I go into one room, a rock jelly spawns alongside of a regular T3 jelly. Later on, in the same level, I go into another room and TWO of the rock jellies spawn together (along with a gun puppy and a couple kats). Oh, also I saw a Moustache jelly but.. the poor thing decided to spawn directly next to a perpetually-exploding-and-respawning line of explosive blocks and immediately died, otherwise I would have spent some time just pushing it around.
Anyways, that was a total of three rock jellies (and a mustache jelly) all in a single dungeon floor. Either that was a pretty extraordinary bit of luck, or... these things are just common up here in T3?
Oh, well then. In that case, I dare say they could stand to be made a little stronger some how. Compared to the regular T3 jellies, after all, they don't have a ranged attack, and I think they can't lunge as far for the tackles either. Not much of a threat for a monster appearing that late in the game, and -practically- constrained to a single level.
Come to think of it, does the Grim Gallery level itself only appear in T3 stratums? I've never seen it in a T1 or T2.

Yep, only T3. Scarlet fortress levels are cool, Eh?
am i the only one who finds rock jellies to look delicious? reminds of chocolate covered jello.

Rock Jellies are like the Lumbers of the Jelly family. They might not have a ranged attack, and they might be So Zetta Slow, but if that thing lands a blow on you it's like getting hit by a train. o_o Hot damn.
The first Grim Gallery I did was in Tier 2, back when they were first released. They should appear in conjunction with Spiral Court; or with Cravat Hall in the absence of Spiral Court in the same strata.

A few days/weeks ago i did Grim gallery in Tier 2 and ofund a baillion rock jellies.
Yeah they're not rare unless its outside of the Grim Gallery. I remember when I encountered this and I thought it was the strangest thing to find so many at once. I looked it up though and found that it was common for the level. And Scarlet Fortress levels can appear in any tier not just T3. When I played Grim Gallery it was tier 1.
Rock Jellies are common in Grim Gallery, But anywhere else in the game they spawn in place of Blocks.