"Um, I would be careful with that. It is magic but seems to be dormant at the moment. I am not sure what might tigger it back to life" (Would I know what type of magic it is/contains?)

Evocation magic

-Taking Aubric words to mind but also wanting to out of curiosity see how this will play out, Druquilla takes out of her pack a hammer and a piton. 

"Try using these," Druquilla says handing Gintarou the hammer and piton. "Aim right in the center of all the cracks."

Druquilla then joins Kraven in the other room in order to watch what happens with the crystal.

( How much did Gintarou's second rock damaged the Crystal?)

(12 damage you have dealt so far but the crystal looks like it can not withstand much more.)

What is Everyone else doing? I have Kraven and Druquilla in the next room, Gintarou and Mist have been attacking the crystal in the center. 

Aubric, Zandeyr and Zenix what are you three doing?

If nothing else by the end of my school day I will have Tordek take an attack at it.

Eldritch blast Attack: 8 Damage: 8

Mist gets caught up in his excitement and shoots wide once again...

Kraven looks over his shoulder seeing Druquilla enter as he is rifling through the desk. "Are they all dead yet back in there? So far I have not seen any traps and I have yet to check the door be careful." As he goes back to searching the desk opening drawers to see what is inside and pocketing anything that stands out.

Shaking his head Aubric will begin to look around the room at the other crystals trying to identify what stars they represent and how they orient to the main crystal, possibly some kind of map itself? (Investigation: 17 or Arcana: 11)

I would say that Aubric does not fully know the day that the map represents, but you would know that those who worship the stars have two annual hollidays and this might be 1 of them.

"Ah…thanks!" Gintarou takes the tools Druquilla handed him. Hammer in right hand and piton in left hand, the warrior stares at the crystal. "Center of the cracks right? Haha, that reminds me of an old Dwarf who taught me something similar during my military days. Let's see how much I remember it!" Gintarou carefully aims the piton and holds the hammer high. Then he hits the piton with all his might.

Athletics: 17

4

Tordek takes his axe and swings at the crystal just before Gintarou strikes it

Attack: 18 Damage: 6

Swing and a miss

Mist grumbles something under his breath, growing visibly impatient, and begins to batter the bulbous bauble with a barrage of booming blasts!

Attack: 11 Damage: 9
Attack: 19 Damage: 1
Attack: 12 Damage: 9
Attack: 25 Damage: 1
Attack: 22 Damage: 3
Attack: 22 Damage: 7

The crystal shaters, a small amount of magic fizzels from what is left.

Mist snorts a satisfied huff and stuffs his pockets with a double handful of shards (carefully) before moving to the next room.

Kraven and Druwuilla are already in this next room, Krave standing behind a desk inspecting it.  there is a dead body at the closed door on the side wall of the room

Aubric would have been engrossed in studying the walls he wouldn't have noticed the crystal shattering. Speaking more outloud to himself "These seem to be arranged in a manner to represent a particular day but Im not sure what day it is, Does anyone else have a guess?" He turns and notices the shattered crystal and everyone else leaving the room. "Hrrmm" He would grab a shard before leaving the room as well.