I think Ida was from some sort of special clan. One Imu wanted eradicated.
Maybe she had buccaneer blood or Davy blood, or something of the sort. Idk.
Anyways I think Imu ordered Harald to kill Hajrudin, causing the rift between the two that led to Harald being DR’d and Loki being forced to kill him.
Realistically I cannot see any other reason why Harald would betray Imu at this point. He already betrayed Rocks for the WG, ripped his horns out, even became a CD and bowed to Imu.
The only thing I can see causing Harald to change sides is if the WG threatened his family. And we know they have no issues with Loki, as Loki was similarly offered a place amongst the HKs. It has to be Hajrudin. He has something special, which is why he’s worthy to be king, and why the WG wanted him dead, forcing Harald to cut ties with them.