Xavier will pass off the key.  Might have to go through the ash instead but he wants to climb the wall across athletics 

15

Xavier saw how deep the ash was getting as Vel was going in and recommends they climb since they cannot know how deep it gets and dont want to fall in something unseen

Velmine comes back to the main room with the group, still looking annoyed due to being the first one to test the ash room. "Ugh. Hopefully, I won't have to go that path again... I'll start searching around the whole place. There may be something besides what's on the bodies..."

Investigation 19

Velmine finds various molds throughout the room reveals vials of rare tinctures and admixtures used in the construction of iron golems. 

Velmine make an Arcana check DC 15 (if you let the rest of the party know what you have found, everyone who is interested can also make an Arcana check.)

Velmine will immediately show it to everyone, knowing herself not to be the most reliable source of information on magic.

Arcana Check: 6

Everyone can make an Arcana check 

19 arcana

"Wait...it asked you to do that?? I would have bargained with it," says Eiren. "But that might not have gone so well. It seemed like a creature from an elemental plane, and those kinds of entities aren't always a safe bet. Perhaps it will feel beholden to us for helping it, if we cross paths again."

Eiren grimaces at the thought of encountering the flying monster again.

"Can we do anything about that lava flow? Maybe if Xavier were to magically control the flames while we jumped the gap, we wouldn't be hurt too badly?"

Once Velmine shows the tinctures to everyone, Eiren will look on, interested. Arcana 15 

Velmine and Eiren look over the materials Velmine found, but don't really know what to make of them. However when Xavier examines them he realizes that all together these materials, which weigh 30 pounds, are worth 5,000 gp.

(I'll allow Xavier to cast control flames as the rest of you jump over the fire vent. That will negate the damage for everyone else. However I don't think that he would be able to jump and predict where any particular flames will be at the same time. So if he chooses to jump also he will get burned. If Xavier agrees you (expect for Xavier himself) can all make it across with no difficulty. And then Xavier needs to decide if he is going to jump or climb the cavern walls.

If everyone wants me to try and control flames while you jump across i will.  then ill attempt a jump to join you.  

Before you guys go does anyone what to haul the 30 lb of materials worth 5,000 gp around with them?

Xavier will offer to carry them if Velmine doesn't want to.  He also kept the 11g he found on the wizard with the key.  

"I can split the load, but I don't think I have room for all that," says Eiren. If Xavier is able to carry the full amount, Eiren is fine with that. Otherwise he could handle about 1/3 of it. 

Once Xavier starts concentrating on his spell, Eiren will take a running leap, and jump the short distance across the trench.

After the rest of the party is safely over the fire vent, Xavier jumps across taking 3 fire damage. 

Looking around the new room you see..

A low, round pool of molten material sits at the center of this chamber. In three of the corners stand several red urns, most of them cracked and empty but a few still closed and glowing with eldritch glyphs. The opening in the Northwest wall contains a White Gate. You neither see nor hear the reddish creatures, so they may have a way of traveling through the Doomvault that doesn't require the white gates. 

What do you want to do?

Does Eiren recognize any of the glyphs on the urns? Or does he have an idea of what the urns might be used for? Arcana (if appropriate) 12

Eiren recognizes the glyphs as some sort of Primordial language, but beyond that you didn't have a clue. After making your Arcana check you think a Detect Magic spell might shed some more light on the matter. 

(As Baik is the true Intellect Man (not really), I shall assist in the research!)

As Baik walks around the room, he thinks back to his studies. He’s researched plenty about Glyphs and Runes in his study for magic, ever since the Light beckoned him. Let me take a look at those.. Baik says, as he moves closer to one of the Glyphs.

Arcana: 18

(Ah Crap, I posted right after him, lol.)

Both Baik and Eiren can make an investigation check DC 12 while you are at it.

Xavier will cast detect magic and start checking around the room.  

Xavier give me an investigation check with advantage.