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In "The Sleeping Sand Legend", a paralogue exclusive to the Verdant Wind (Claude's) route, Claude travels to the Sreng region to investigate a legend about Macuil's treasure. There, the army fights The Wind Caller, who is Macuil himself in the form of a magic beast, a quadruped raptor creature.
Having grown disgusted by humanity, he refuses to interfere with the ongoing war even after learning that Seiros is in danger from Seteth (who is Cichol in disguise). He bears great hostility towards Claude for being a descendant of the Ten Elites, and is less than friendly towards Byleth for carrying the "stink of Sothis." Whether he dislikes Sothis herself, or thinks Byleth is a descendant of Nemesis, the one who consumed Sothis' blood and gained her Crest of Flames, is not completely clear. By contrast, he is pleased to see Flayn, but in his eagerness to converse with his niece, flusters her for nearly exposing her true identity as Cethleann.
Following the battle, he falls asleep. Claude takes the Sword of Begalta from him as his reward.
The Wind Caller: If you are not going to flee... I shall take your life as payment!”
—The Wind Caller's default battle quote in The Sleeping Sand.
Seteth: They are indeed. I should tell you that Seiros is in a precarious state right now.
The Wind Caller: I will not assist you. I have lived apart from the world of man, which disgusts me. This war disgusts me also.
Seteth: I thought you might say as much. This is regrettable.”
—The Wind Caller's battle quote with Seteth in The Sleeping Sand.
Flayn: I ask that you keep quiet, Uncle!
The Wind Caller: Why the rush, Ceth-
Flayn: Shh! Please keep quiet, Uncle!”
—The Wind Caller's battle quote with Flayn in The Sleeping Sand.
Claude: I'm the grandson of the grandson of the grandson of the elite Riegan. Now tell me who you are!
The Wind Caller: I am your family's enemy. If you carry the blood of the 10 Elites, you cannot be permitted to live.
Claude: What do you mean by that? And what's that Crest on your forehead?
The Wind Caller: No more talk. If you wish to survive, you must destroy me!”
—The Wind Caller's battle quote with Claude in The Sleeping Sand.
The Wind Caller: You have the stink of Sothis upon you... Let us find out whether you share her power.”
—The Wind Caller's battle quote with Byleth in The Sleeping Sand.
Claude: It stopped moving... Is it dead?
The Wind Caller: Zzz...
Claude: No... It seems it's just sleeping...
Claude: I thought we were supposed to be given the treasure, but... Forget it. I'll just have a look around there.
Claude: What about this thing? Huh. I'll think about it later.”
—The Wind Caller's defeat quote in The Sleeping Sand.