bound by a poison's lie

this is an FTO au that takes place in Selode, but in this au, Selode does have magic, but it's different than the type of magic found in Atlantide.
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Selode, a land that is ruled by three kingdoms, each had two princes.
The kingdom of the wolves,
The kingdom of the humans,
And the kingdom of the glacier sirens.

The kingdoms had always battled for more territory, wanting to be the true rulers of Selode. But, when the darkness arrived, they had to put aside their differences and work together to save life as they know it. After they succeeded in defeating the darkness, they ended the war and decided on peace, knowing that they were stronger when they worked together.

The three kingdoms lived in peace for thousands of years, until the darkness returned.
The creatures poisoned the youngest prince of each kingdom, before framing the other two kingdoms.
The kingdoms blamed eachother, causing a terrible war to begin when no one admitted to poisoning the princes.

But the three young princes, knew that it wasn't the other kingdoms that poisoned them, they knew that it was the darkness that did it.

Now, prince Ritchie of the humans, prince Bryan of the wolves, and prince Lucas of the glacier sirens, must work together to save their homes, families, and the world...
But can they succeed, before the darkness takes them out?