Brunella pulls out one of her javelins. "This is made of steel, with a strong wooden handle. Will this be strong enough?"

"That should do it, can you jam it inside...there" said Kurma, pointing at specific place under the chest. Then looking at Oniss, Kurma adds: "Oniss, could you use you magical abilities to open the lock please?"

Brunella heaves, and tries to place the javelin to block the mechanism.

The Javelin seems sturdy enough to keep the trapdoor on the ceiling locked. 

Meanwhile, Oniss performs a spell to unlock the chest at the bottom of the stairs. "Done and done!"

However, it seems inside there is... nothing. The aura of illusion is still present, though, around a small object inside the chest.

"Let me check first", says Oniss, followed by a whisper and a hand gesture. A spectral hand appears floating on top of the chest and starts searching the content.

"There is something... it seems... a key? An invisible key."

Quote from BeastyC >>

She will proceed Into the room staying vigilant and looking for traps.

perception: 21

No trap is detected by Isabella as she steps into the room. However, ten minotaur murals adorn the walls on the lower level of the room. Each mural covers a section of the wall designed to be a secret door.

About the maze located on the northern wall: the intricate carving shifts before your eyes, its configuration ever-changing. The maze has no exits, and its corridors are lit by tiny torches and clouded by fog.

Kurma looks around, with so many things going on in this room it would be easy to miss one crucial information. He closes briefly his eyes and converse with Moa.
"Moa, do you recognise this sarcophagus? Is this one of you?"

Quote from RonanKP >>

Kurma looks around, with so many things going on in this room it would be easy to miss one crucial information. He closes briefly his eyes and converse with Moa.
"Moa, do you recognise this sarcophagus? Is this one of you?"

 "I think this might be the place where Unkh the Flail Snail rests."

“Fascinating...” Isabella scribbles down some notes on the maze and returns to the group. “Well this maze is ever charging quite unique and what of the sarcophagus?” Isabella will turn her attention to it and begin to inspect it. 

Perception: 20

There is a keyhole on the sarcophagus.

The crystal sarcophagus changes color every 6 seconds, shifting through the following repeating cycle: blue, gold, purple, green, red, black.

« Well, we have a key. Do you think we need to open on a certain colour ? »

Kurma walk carefully around the room, without touching anything but inspecting every aspect of the mural for any clues on how to open the sarcophaggus"

The murals seem to not give away any suggestion on the sarcophagus should be open. The most obvious way remains a key.

In that case Kurma warn all his companions "Be on your guard, I'll try the obvious thing. Who knows, there might no trap here !" he added with a half-smile.
"I'll turn invisible just in case".

And with these words, Kurma disapears and try to use the invisible key on the sarcophagus.
"I'll try to activate the key when the sarcophagus turns gold" said Kurma 

The invisible key doesn't fit into the keyhole.

Kurma will try his Mystery Key

The mystery key fits into the keyhole, but it doesn't turn the mechanism.

"Gold doesn't do anything. I'll try the other colours " said Kurma.

The Tortle then try to open the lock on the different colours as they appear.

The key doesn't seem to work with any of the changing colours.

"Nothing..." said Kurma frustrated. He then walks to the ever changing mural and try to place the key on the mural murmuring "who knows.... It might work"

As Kurma does his thing on the ever-changing maze-like mural, he disappears in into thin air and the ten walls there the minotaur murals come all down. Beyond them, there are small rooms fills with bones. Moving bones. They become animated to form the skeletons of minotaurs. Their intents is not good.

Kurma:

OOC Everyone, Kurma included, roll initiative!!!