I'm expecting something like weekly Morpheus Arms, or Weekly Titan's challenge, because they NEED us to want these 11 Divines. That's a serious investment we're undertaking.
However, I do not think they'll risk crashing an item market, especially by coming already this close with a Timer every 4 days?

I'm kinda hopeful that there could maybe even be a Nyx or a Scales in there as the big big prize.

For some reason, the 15 year old party is already open on the Aus server?

It comprises of making timelines for different items, companions, and etc. There are 15 levels of prizes with the jackpot being a new divine Quindecim. However, you only get like 5 chances to make mistakes on your timeline before you have to wait for more chances.

His powers??

He's a unicorn.Quindecim is a divine horse created specially to celebrate the game's 15th anniversary.

Add 2 passes to its meter by completing your first daily objective of the day.
On the 8th of every month, collect all the passes gained so far. Passes are doubled if you collect them on September 8th. 15 collections possible.
This horse cannot be sold.

Here are the prizes:
Level 1 Ow companion Companions timeline: cat, bear, panther, orca
Level 2 15 passes Luck items timeline: HoP, TC, GF. Companion chest
Level 3 3*** saddle cloth 15 years Equipment timeline Poseidon, blue blanket, legendary tack, christmas tack
Level 4 15000 equus Wild horses timeline
Level 5 Silver card Card events timeline
Level 6 15 year frame
Level 7 Vintage apple
Level 8 15 days of subscription to Pegasus account
Level 9 Ow's Helios ray
Level 10 selle francais unicorn
Level 11 Original wanderer's spirit
Level 12 15 year trophy
Level 13 150 Sleipnir fragments
Level 14 Bewitched Pumpkin
Level 15 Quindecim

Does it mean that you can collect passes from him ONLY 15 times, so he'll be left powerless by February 2022?

Honestly, not that sure. I have not gotten the divine yet. I got stuck on Level 5. I wasn't really around back in the earlier stages of the game so the timeline is kind of tricky for me.

Personally, the rules for the timeline were kind of unclear. They don't tell you about how many chances you get to make a mistake or whether you're earning chances every how many hours. After trying it out, I think it's five mistakes before waiting.

From how I understand it, each month you get however many passes your meter has, with it doubling if you get passes on the 8th of September, with a max collection of 15 times. It only being useful for about 15 months is a bit meh, but this looks like it will be a completely free divine which gives a fair amount of passes in total if you do the first objective every day.

This divine is really interesting, and I adore the art, so even if he is only useful for a short amount of time, I won’t mind because he’s pretty. The prizes for the event seem really good, so I’m excited for it to play out on this server.

Ooooo, definitely excited for this one! and Sleipnir fragments?? count me in

"There are 15 levels of prizes"
what does that mean? what are we doing in order to get him? and do we only have tomorrow to get him?

Here is the Ow companion and its +15 stamina bonus

This looks like a collaborative effort of the community, which is nice!
We'll come together and make the event together, so that everybody can go home with Quindecim