Hallanann will look around where others aren't already looking. He's mostly just looking for any clues as to who has been here, how many people, and perhaps what they've been doing.

Investigation: 19

There doesn't seem to be anything else to discover here.

"Well," Vor says, "There be no thin' round th' alt'r I ken find, I say we check th' lib'ry, th' sleepin' chamber, then the one wid th' stairs.  Don' like t' leave m' back uninvest'gated. Helps keep th' 'oles t' a minimum."

"Should we check below?" Chikra looks for signs of passage on the stairs in the side chamber. Investigation: 7.

“Why would someone keep this place clean if there isn’t anything that is going on? There’s probably something secret we’re missing.” Krusk will perceive and investigate the temple.

Perception: 23

Investigation: 13

"We should clear one level at a time."  Lia points out.  "Last time the group I was with split up, several were in the upper floors of a tower that was burning and needed to be helped out."

"The Library might have something that will tells us of this place, maybe even plans of the temple itself."  Vor says.

"I agree with both Lia and Vor," Hallanann chimes in. "Let's check the library and make sure we stick together. Better to face a threat as a group, if there is one."

The temple’s southeast wing houses a library of sacred and historic texts dating from many centuries before the Divine War. The interior walls are lined with six tall bookcases holding this small but well-preserved collection. The center of the room holds three long tables and a scattering of chairs that once served as a scriptorium and study space for visiting scholars and copyists. During the day, this room is filled with natural light from the three tall, peaked windows in the outer wall. When the characters arrive, there is a stack of books and scrolls on the central table, next to an oil lamp that shows the signs of being recently dusted off and lit. The volumes here were consulted by someone a few days ago.  Books are still out on the tables.

Vor will examine the books on the table to see what the reader(s) were studying; that is if he can read any of them.

Arcana   20    History   15

Hallanann will look over Vor's shoulder to see if anything stands out to him, as well. If not, he's going to look at the titles of the other books on the shelves to see if any of those might be related to what happened at the academy or the Clasp.

Perception: 10

Arcana: 20

Lia will look around the area trying to see if she finds anything else of interest or use.

Perception: 6

Krusk will also look for anything about the academy and the Clasp, and anything in general that would be useful.

Perception: 15

Investigation: 6

History: 17   :0

Arcana: 10

Vor would need a religion check to figure out the significance of the books: Religion 11 vs DC 15

Hallanann also tries: Religion 5 vs DC 15

The library of the temple of Madriel contains a wealth of arcane, religious, and historical knowledge, which the characters may well be tempted to take advantage of at various points in this adventure. If they wish to do so, they can use it in either of two ways.

1) A character who wishes to simply use the library to acquire general knowledge can spend two hours in dedicated study, and chooses one skill from Intelligence (Arcana), Intelligence (History), Intelligence (Nature), or Intelligence (Religion) to focus on. Once within the next ten days, the character can roll with advantage when making an ability check using the chosen skill.

2) A character who wants to use the library to find specific knowledge about a subject can attempt to track down that information in the library’s manuscripts. This process takes 1d4 hours and the character must succeed on a DC 10 Intelligence (Investigation) check to find the right sources. If this check succeeds, the character can then attempt a DC 13 Intelligence (Arcana), Intelligence (History), Intelligence (Nature), or Intelligence (Religion) check (at the GM’s discretion, depending on the knowledge sought) with advantage to learn the desired information. 

The library’s collection is particularly focused on subjects of interest to the priests who built and used the temple. These subjects include: the history of the Divine War; accounts of the origins and deeds of the gods, especially Madriel; studies of the effects of Mesos’ Bane; the history of Ghelspad leading up to the Divine War, and the effects on its geography in the first few decades of the war’s aftermath; and surveys of the flora and fauna of the Kelder mountains, including the titanspawn. Inquiries concerning these subjects are likely to yield more complete information that most other areas.
There are even a few books here that have information on Maghiel herself and her role in the Divine War. This information is somewhat more difficult to track down; the research takes 1d4+1 hours and requires a successful DC 13 Intelligence (Investigation) check.

Please feel free to roll as needed, and re-roll (the awful) rolls I did for you.

Krusk is looking for information on the Clasp

d4: 4

Investigation: 11

I believe that I should use arcana for information about the Clasp

Arcana: 17

Hallanann will also look for information about the Clasp. 

1d4 hours: 4
Investigation: 2 (yikes! lol... Nat 1)

He will also want to look for historical information about the town they're in and whether or not it has any magical or religious significance.

1d4 hours: 3
Investigation: 13

Vor will definitely want to try again to see if he might glean something from the texts.

Religion   6

AS in what the reader was reading about, not necessarily to 'learn' any thing.

"We'd best be lookin' t' see's whether o' no the reader's nae be somewhere near.  Clear the temple 'n' they be plenty o' time t' learn 'ere."

Since I failed at the first investigation check, but passed on the second one, I'll focus on the historical/religious significance of this town. 

Religion: 18
History: 8

((I failed both, regardless. lol  Goodness.))

While the others do their research Lia will check out the rest of this bwing, looking to see if anyone else is about.

Krusk finds that raw power can be channel using the Clasp of Vergren. Enough power to wake the Sidereon from its long slumber without needing a key.  Sidereon is a huge orrery made of alien metal and gemstone, covered with indecipherable symbols and glyphs.  The clap can also be used to create a wave of eldritch energy, which can create mutations.

Hallannan Finds that the temple that you are in has been leaking eldritch energy for decades.  The town of Lapo was all but abandoned when mutations started to be seen in the wild life.

Vor finds that all these works are all concerned with the theoretical origins of the gods and other divine powers, and particularly with the lore of the titans and the rites of their followers.

When Lia steps out of the library she  sees a monster.  Though banewarped, he remains more or less recognizable as a satyr: horned and hooved, with much of his body covered in patchy dark wool. But his right arm has been replaced by a cluster of fleshy, twitching tentacles, and his left shoulder is a hunched mass of tumors and bony spikes. In contrast, his face is particularly comely even for a fey creature, and his voice is beautiful and melodious. He looks shocked to see you and drops to his knees, and turns so as not to see you.  "Please, spare the temple.  I beg you, leave the books.  You can have my gold.  Take my life if you must, but please do not desecrate this temple."