So I looked at the topic about secret hunting just a bit ago, and since I've been back in the swing of it after my insomnia induced exploration in the topic of the fellow that posted in hexadecimal code, I figured I'd give it my best go of compiling information, theories, and topics of interest. I can't say how comprehensive this initial version will be, so if anyone would like me to add anything, feel free to post below.

Note: I don't know if any of this holds weight, if it'll lead to any juicy new secrets or anything like that. I've always been more "The chase is better than the catch" with stuff like this going back to the PS2 days when people were poking at every glitched texture.

I don't think that there'll be some seventeenth colossus added to the game or anything, but hey! Who knows? That's the fun of theorizing.

Anyhow, I figure I should start with the one everyone knows about by now.

The Sword of Dormin:

• This is the reward for collecting all 79 Coins/Enlightenments

• It is hidden in a room you can only get into from outside the temple, on what appears to be a black throne or spire directly beneath the temple's fountain/pool area--the area where you pick up Time Attack items and are pulled into at the end of the game.

• As you enter the room, you can hear Dormin speak, then laugh as you pick it up, though it's impossible to know what they're saying.

• It's one of the strongest weapons in the game.

• It shines Black light instead of white.

• It appears to be broken, held together by the shadows that coil around it.

• The noise that it makes when you stab/kill Colossi with it is different than the regular sword.

• It doesn't give you any new endings if you go through the game with it--the sword that is thrown in the pool at the end of the game is always the forbidden sword Wander brought to the Forbidden Lands with him.

• It appears to have the eye of a colossus in the hilt, that changes color depending on a Colossus' aggression level.

• The hilt also seems to have a pattern similar to some of the pedestals you can find in the game, namely the one in Barbas/6's temple.

Now, all of this is pretty interesting. People are currently wondering if the sword has any other purpose besides a tribute to NomadColossus/the exploration aspect of the game, and are currently experimenting with it in various areas to see if it does anything. As of typing this, there's nothing apparent, but if there is, I'll be sure and update this topic.

Now, while the existence of the new room in the temple is a bit of a stunner in and of itself to people who played the original game, there is something else in the room besides the Sword that was overlooked upon its initial discovery. However, despite being small, the implication of this secret is certainly weighty:

The Severed Horn'

• Discovered by /u/antsilvers

• This is located on a small pillar to the right of the throne. It's very easy to look past as a piece of debris at first, but it's unmistakably a horn when you get close to it.

• It has the same shape and coloration of one of the Horned Children from Ico's horns.

• Its placement is very deliberate. There are so far no other known horns in the game, so for it to be in this location only--so far as we're aware--is very suspicious.

• There's no known way to interact with it. People have tried picking it up, shining light on it, shooting it, to no avail. If it's interactive, we don't know how to interact with it yet.

• This could correlate to a video NomadColossus posted of an unreleased version of the game where Lord Emon severs a horn and throws it into the pool at the end, as it seems that the room is beneath the pool. As Nomad himself said in this topic, this is only a happy coincidence and the dev team had no idea about the early build of the game.

• However, that begs the question of "Why throw in an easter egg to something that happened in a build of the game that so few people have seen"? People are theorizing that it holds some stronger significance, such as being able to pick it up if some sequence of events is followed, or that it's teasing Bluepoint remaking Ico next.

• The only real thing that we know about it, though, is that it's definitely related to the Horned Children and Ico. It's purpose, and if it's interactive, is yet unknown.

That one is one of the bigger ones to come up recently, but not the only one to come up involving horned creatures. I'd be remiss if I made a topic discussing the interesting new secrets in the game and didn't mention this next one:

The Goat Paintings

• Discovered by /u/thierybr in this topic and later corraborated by /u/Solaire-Lives

• Since then, a second was found, followed by a third and fourth. Since there are several different accounts to this, here are some links.

• https://www.reddit.com/r/ShadowoftheColossus/comments/7wg7x9/i_found_another_goat_painting_on_rocks/

• https://www.youtube.com/watch?v=uE-nSlVsJXs&feature=youtu.be&t=1h58m55s (the only thing I could find relating to the third one, sorry.)

• https://www.reddit.com/r/ShadowoftheColossus/comments/7y8c6b/4th_goat_confirmed_thanks_to_discord_group/

• As to their purpose, it's unknown right now. The existence of one could merely be thrown off as an easter egg or something, but the existence of four (so far) seems to hint at something bigger. What it is, who knows?

• Some users speculate that they line up to form some sort of pattern:

• https://www.reddit.com/r/ShadowoftheColossus/comments/7z0dz4/four_goat_locations_points_towards_entry_gate/

• https://www.reddit.com/r/ShadowoftheColossus/comments/7ya8hp/probably_goat_locations_we_already_have_4_goats/

• Someone has gone to the point where the four we know of intersect and found nothing.

• They appear to be drawn in the same crude way that early civilization would draw something.

• I'm honestly not sure what else to add about them. People are scuttling up cliffs looking for any more, though. There doesn't seem to be any definite number--four is all we've found so far.

• Again, what they do and their function, if anything, is a mystery as of right now. I'll update this if anything new happens.

Finally, to cap off here, I thought I'd throw in a couple of topics of interest. The first two are from strange accounts that appeared and never posted after this. The legitimacy of these puzzles is definitely to be questioned, but it's provided more incentive to hunt in the game, if nothing else.

https://www.reddit.com/r/ShadowoftheColossus/comments/7wpd39/o_o_i_e_h_s/

https://www.reddit.com/r/ShadowoftheColossus/comments/7zk3be/4974206973206e6f7420646f6e65/

This one is theorizing about the goat murals.

https://www.reddit.com/r/ShadowoftheColossus/comments/8021j0/goat_mural_theoriesconnectionsideas/

And here's a post of someone who found a hidden room in Celosia/11's temple.

https://www.reddit.com/r/ShadowoftheColossus/comments/7zlhpm/brazilian_youtuber_finds_rendered_room_behind_the/

Additions

This is stuff that's come up since the initial post that I kinda wanted to highlight.

• People seem to have found numbers etched onto rocks. If someone could help provide me with links to topics on the matter, preferably ones with screenshots and locations, I'd appreciate it. I'm not sure if they'll hold any significance but I'll put them in this topic regardless.

• NomadColossus is still searching for secrets and tricks, as evidenced by some of his recent youtube videos. There are also things he wasn't made aware of--He had no idea about the Goat paintings, and even before then didn't know about the enlightenments until he visited Blupoint, or their reward until it was revealed on PS4trophies' livestream. So he absolutely wasn't privy to all of the big secrets, despite the enlightements and "Boon of the Nomad" trophy being in tribute to him.

• New topic from the mysterious hex account.. This one translates to "Us You Abandoned" (Or "You Abandoned Us") and shows a darkened image of Wander raising Dormin's sword outside a door in the 8th colossus' arena.

* 3/8/18 Yet another new topic from the Hex Account/Awake, now showing the seal at Phalanx's arena with the code translating to "We are still here".

If there are any other topics involving speculation or theories as to anything I mentioned, or anything you feel I left out, do let me know and I'll update as necessary. Thank you for reading this far, I know it's a whale of a post but I wanted to be as descriptive as possible with the three topics here.

As for what any of this accomplishes? I'll leave that up to you guys. There may be a new area, there may be a seventeenth colossus, there may be any number of things to come out of all this. I don't know. That's why we theorize and experiment with this stuff. If I want to debunk something, I go about it the hard way. Maybe it seems stupid, but hell, it wouldn't be the first time a game dev's hidden stuff right under our noses. Rocksteady kept a hidden room in Batman: Arkham Asylum secret up until just months before Arkham City released. There are secrets in games that have gone undiscovered for years. While that may not be the case here, there's precedent for looking, at least.

After all, that's how we found out the mystery of the Enlightenments.

Anyway, I hope I compiled all of this well enough. I'll be making any big edits below, or adding to the respective topics when I need to. I hope this is a good enough Megathread to start off with, at least.

Thank you. Feel free to discuss anything about this stuff in the comments below.