A New World

History check to see what the Temples of the Sun and Moon are.
16+9=25
I guess add 5 if it is related to omens (totally going to get fk of the llama religion once I switch over to the new system)

Back home you have temples to Father Sun and Mother Moon, and there's the Temple of the Sun AND Moon in the capital, but no, that can't be what the... llama?  is saying.  

He is more likely referring to the two enormous pyramids in the city you just left- dedicated to the ancient dragons' own versions of the celestial gods.

I'm actually going to do a history check on what the old dragons thought the Sun and Moon deities were. That falls under Dragonlore, right?
 
History: 12 + 11 + 5 = 28 pretty good, I think.

Dragons have actually had a number of myths concerning the Sun and Moon. The temples in the old city are dedicated to all of them: and are largely dedicated to the Sun and Moon themselves: with each containing the Solar and Lunar calendar day markers respectively.  
Some of the versions of Sun and Moon gods:
Ix Chel, Godess of the Moon, fertility, and medicine, and Kinich Ahau, God of the Sun
Alternatively, it is sometimes believed the Hero Twins of legend ascended to become gods of the Sun and Moon (or the sun and moon themselves)
Finally, the other main legend, is that there is (or was) a god of the Sun AND Moon, although most tales have him being thrown down by the the Hero Twins for some reason.

I'm certain that this llama will either betray us, trap us, or be otherwise inconvenient, but damn if this hook hasn't hooked me. I'm a sucker for mysteries, it is my one weakness. Well, that and romances. And tragedy. And comedy, and... I should stop now.
 
Either way, I know I'm suggesting splitting the party, but it seems reasonable in this specific instance, since Piasa and Rufus basically share a mindspace, it allows for constant communication between the two groups. Also, I really want to know who this guy is, so I'm going to follow this little, probably wrong thread of thought in my mind, and roll history about the enemies of the Sun and Moon Gods/Twins/God/whatever, because that whole "what do they call themselves now" line still sounds suspicious, and "I JUST CAN'T" is REALLY suspicious. He also sounds too much like Discord for me to not kinda like him right now.
 
History: 8 + 11 + 5 = 24

Ah, I'm flattered to hear you say that.

Anyways, your history check:

Ix Chel and Kinich Ahau aren't known to have any particular enemies: though the gods are known to be jealous of each other and the attention and offerings by mortals.

They rarely impose on each others domains though, which is why the tale of the Hero Twins is so odd.

The Hero Twins made many enemies on their adventures, defeating many foes through a combination of clever trickery and martial prowess. The most notable of their enemies were the lords of the underworld, and Vucub Caquix, from whom's defeat they acquired their status as lords of the Sun and Moon. Though they defeated and humiliated many other gods and demons who might have borne grudges against them.

Well, Curunir, I just have a great big ol' soft spot for the Sheogoraths and Sanguines and Discords and Qs of the world. Powerful crazy people make some of the best characters, you know? Any way, that history check does seem pretty useful, I just need to figure out how to use that information.
 
Anyways, time for adventure soon! 

It's practically impossible to miss the Temples, as they tower above every other building.  

Which one will you be going to first?

Yay I have free time to post stuff and am immediately making two history checks, because I have not yet squeezed enough information from the DM to fill a bible yet. Firstly is a check to about how the versions of the Sun And Moon gods were worshipped in this city, and secondly a check to see if their worship involved any architectural trickery we should be wary of(such as the Aztec{I think} when they built their temples in that weird way I can't remember the specifics of). I don't think the first falls under dragonlore, but the second is definitely falling under Old Draconic Architecture.
 
History(1): 13 + 11 = 21
 
History(2): NAT 20 + 11 + 5 = 36 God damn that's amazing. Oh that feels so good after the week I've had.
 
Hopefully it won't be another week before I post again.
 

Here you go. As always, with such a successful check I'll try to mention anything else I've forgotten to mention or come up with later that directly relates to your check.

It's been so long since the city has been occupied, it's unsure exactly how worship was conducted (or who or what was worshipped), though it seems clear this may have changed over time. Various levels of the two pyramids have alcoves dedicated to different versions of the gods, and the summit temples seem to take a decided effort to not side with a specific god: instead being devoted directly to the sun and moon and respective calendars.

There are a few interesting architectural features in the construction of the pyramids: mostly tricks of light: with the Pyramid of the Sun marking solstices and equinoxes with a snaking pattern of light down its stairs, with thy pyramid of the moon doing the same each full moon. The summit temples also allow light from their respective spheres to enter, shining in particular ways on specific days.

The two structures are also built atop notable geologic features: the Temple of the Moon was supposedly built atop a spring, though its various fountains have long stopped working, and the Temple of the Sun was built atop a deep cavern system.

According to legend, the temples could defend themselves, with the temple of the Moon using ice, water, and stone, and the Sun using light, fire, and molten earth.

The skull should fit on Arcantos's head, even if possibly more snugly than on the griffon. The skull is that of an old, and large (though not monstrously sized) dragon whose head had, at time of death, been larger than Arcantos's.