While these techincal difficulties are worked on, can you give me some insights on these special tiles which are spawned in the world?
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Bradeline's Well: Can explore with a level 4 (IIRC) unit, after a few turns will roll a result from either the Very Good or Very Bad results tables, which you can find detailed elsewhere on the internet. Exploring unit always gets 1 exp, and can try again a turn later if receiving a Very Bad result, assuming they survive.
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Broken Sepulcher: Same as Bradeline's well, plus grants Death Mana if roaded.
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Dragon Bones: Grants the tile it's on +3 commerce (which you can increase with certain techs), provides ivory, grants +1 happy to nearby cities.
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Guardian of the Pristine Pass: Spawns three hostile Gargoyles if you walk within a tile or two of it, after a brief grace period (around 30 turns).
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Letum Frigus: Only source of Ice Mana aside from the Illian Palace. Gives the Aggressive trait to the Illians if they're the first to enter the Frigus tile, or an instant golden age to the Amurites if they do instead.
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Maelstrom: Either teleports units which explore it to a random water tile anywhere on the map, damaging them in the process, or destroys them entirely.
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Maenalus: Same as Bradeline's well, except only appears on ocean tiles.
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Mirror of Heaven: Grants the tile it's on a large production boost, provides Sun Mana if roaded, grants range over an enormous area if you have a unit parked on it (
not if it's merely in your culture but otherwise unoccupied).
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Odio's Prison: +25% strength to all units within 3 tiles. Mostly just a waste of the tile it's on.
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Pool of Tears: +1 happiness to nearby cities, units on it heal 50% more quickly and are instantly cured of the Disease, Plague, and/or Withered "promotions".
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Pyre of the Seraphic: Okay, this one is pretty nuts. Same as the Broken Sepulcher, except with Fire instead of Death Mana, AND you can sacrifice any non-summon Angel unit on it to do heavy fire damage to bordering tiles and gain a
permanent Fire Elemental. Except Angels with the Heroic promotion, who grant like nine Fire Elementals instead (rarely worth it in their case, though). You're very fortunate if you're playing as Basium and have the Pyre still standing in your territory. The AI has no idea how to use this ability.
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Remnants of Patria: +3 happiness to nearby cities, +3 hammer bonus to the tile it's on, which you can boost through certain techs.
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Ring of Carcer: Does nothing by itself, but contains Brigit; if you can manage to get a level 15 unit you can enter the Ring and will be rewarded with Brigit, an outlandishly powerful hero unit (this is pretty easy for the Calabim, very difficult for everyone else).
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Seven Pines: Entering it while at war will, for one time only, allow you to force a cease fire with everyone you are fighting (except the barbs). Note: not a peace treaty, so there's nothing stopping you or your opponents from redeclaring whenever.
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Standing Stones: +1 happiness to nearby cities, Earth Mana if roaded.
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Tomb of Sucellus: +1 happiness to nearby cities, Life Mana if roaded, +25% healing to units standing on its tile.
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Yggdrasil: +1 happiness to nearby cities, +3 food bonus to the tile it's on, which you can boost through certain techs, grants the unique Fruit of the Yggdrasil resource if roaded, which provides an additional +1 happiness and +2 health.
I realize that there are some kind of interactions possible, either for all or just some CIVs (Letum Frius seems to be only enterable when playing 1 of 2 specific CIVs). Is there a place where I can look these up?
The in-game Civilopedia lists them all out under "Unique Featuers", or just consult this post
The wiki seems to stay purposedly vague on them.
The wiki contained embedded malware several years ago, so I wouldn't bother with it. I'd also run a virus scan.
Also do you recommend playing with Orthus and Archaon (the Dragon who spawns in a barb city and is a huge pain)?
Orthus, yes- he adds some spice to SP games, and his Axe is an awesome piece of equipment if you give it to a unit with high mobility (it grants +1 Strength and Blitz). Acheron, probably not unless you're playing on a map with a lot of free space, since his city spams culture all over the place and will make a large area unusable for most of the game. He's not even all that great a unit by the time you're able to capture him.
Are any of these to be expected in this game?
I think they're banned in the current settings. Dave doesn't like fun