Zenix casted Infestation upon the plants so that the crawlies would eat away at the plants.

Zan grips his longsword with both hands, seeking to trim the hedge.

Attack: 7

dmg: 11

Then he books it back with the others.

Next time you post a spell please add to it the damage roll with damage type, and if it is a saved spell like this one is, please add what the DC is and what Ability it is, so for this action it would be Con save DC 14 or 5 poison damage

Con Save- 11

Gintarou's attack with the back end of the glaive he sets a little fire to the plant creature as he falls and stops moving.

The rest of the party's attackes take down the second one.

Each one with a little fire burning the dead plant body.

"So first we come across bandits, then we see remnants of people triggering deadly traps, and now we come across large living mushrooms," Druquilla sighs in frustration shouldering her bow. "The compass better be here or so help me I am putting an arrow through that fool's head and feeding him to the fishes, maybe even that crab back in the pool."

"Bigman," Mist calls to Gintarou from the back of the group. "Think you can pull your lasso trick again and get that vase and the necklaces? Less worried about the pot but those beads caught my accessorizing eye!"

I would say that Mist got "Beads" seeing as I was under the impression you were touching the nature, which is what the trigger was for the monsters.

13

I would also say your confadent that there are no other plants that look like the things that attacked you guys.

Excellent. Anything immediately remarkable about the vase or the necklaces (or names to put them under in the inventory)? We can always entreat our wizard to identify things when we get back if he feels so inclined.

Porcelain vace 25 gold, jade necklacess 15 gold each.

Zan coughs.  "Don't look like no compass I ever seen.  Onward!"

As I posted before the door is not trapped and it is unlocked.

This chamber resembles the  interior of a large geode. Natural  crystal formations grow in clusters  in the corners and along the ceiling and walls.  A single large crystal, a blue quartz about 4 ft.  tall, emerges from the ceiling of the room. The entire room has been structured with  meticulous accuracy and the numerous crystals  seem to glow from within, glinting and glittering  brightly when exposed to any source of light.  Kraven, Gintarou, and Drquilla with your passive perception, as the torches move in the room you notice thick piles of fine ash in the corners. What do you all do?

Quote from Ashen_Age >>

Zan coughs.  "Don't look like no compass I ever seen.  Onward!"

 "Indeed, my fine feathered funambulist! However, we are looking for a compass to trade for gold and these treasures similarly convert to gold so I'd say they're close enough to keep on hand." Mist grins and shrugs as he stuff the loot in his pack.

"Sorry to disturbing you. I like mushrooms but hate to be eaten by mushrooms." Gintarou prays for the dead monsters. The warrior finds a pile of ash when he peeks into the room of crystal. "I think we find the another member of the last explorer. " Gintarou uses his polearm to see if he can stir the ash without entering the room.

(Please tell me which skil check I should roll, if Gintarou can reach the Ash)

You would not have been able to see them before entering.  Nothing happens when you "stir" the ashes.

Kraven will try and study the walls and floors from the door frame and then if he does not see anything will fly over to the center crystal and inspect it as well.

Perception walls/floors: 16

Center Crystal: 15

Mist is drawn to the sparkly crystals and looks carefully at them (without touching anything) to determine if there's anything magical or unnatural to them.

"And what might we have here?" he muses as he leans in and squints a bit for a closer look.

Arcana/Nature: 4 (<- straight d20 roll +4 if you'd prefer arcana, +2 if nature)

If he survives his inspection, he'll check the ashes to see if there's any indication as to what they used to be or from which direction whatever caused them to become ashes came (magical blast marks...?)

Investigation: 12

So what Mist has figured out from the two rolls. 

First the crystals make a star map.  The larg crystal in the center represents the world, and the rest mark positions of stars.

As for the ashes and the center crystal.  You see that the piles of ash are are at a location that you could trace back to the center crystal.  You know that it is not active, and you are >90% sure that you can destroy the crystal with out being hurt.