Even if Vishy was included, the World Secret Domains they had truly come into contact with numbered only the Gilded River, Dream Country, and the Wishing Pool.
Of those, the Gilded River could no longer really be considered a "secret" domain. It was practically a public domain for Human Rights. Any Two-Winged Sorcerer would definitely have come into contact with it, and even if they did not know the meaning of a World Secret Domain, they could still discover two distinct features of secret domains from the Gilded River:
First, it automatically produced spell spirits;
② It had a permanent effect.
Before Dream Heaven shattered, spellcasters could obtain Enter Dream Spell Spirits from it—one of the main materials for Faded Dream spell spirits was the Enter Dream Spell Spirit—but to obtain an Enter Dream Spell Spirit, they had to pass Dream Heaven's natural trial. Otherwise, it would not have been one of the difficult hurdles on the Path of Origin.
The Gilded River and the Wishing Pool needed even less explanation. Not only could both produce spell spirits, but their permanent effects were also enormous threats to spellcasters: the Gilded River could super-accelerate the passage of a spellcaster's time, and so far, the only thing immune to the Gilded River's influence was the Armed Troops "Six-Colored Anchor"; the water of the Wishing Pool would make spellcasters feel the wishes of tens of millions of people, and if their will was not firm enough, even their self-awareness would be completely dissolved inside it.
Looking across the three World Secret Domains, their permanent effects were not aimed at living beings. They were simply natural phenomena produced by an extreme concentration of resources, like a bonfire formed by a massive pile of firewood gathered together and set alight. It was just that compared