Arobynn is a
man in his early thirties and is an absolute fucking bitch because he killed SAM CORTLAND Celaena's boy because he thinks Celaena is his property. He was the assassin-king of Ardalan but thank the
fucking lord Celaena was actually Aelin and got her
friend Lysandra, who Arobynn used in the bedroom, to slit his throat. In conclusion, Arobynn is a dick and deserved to die and if hopefully being eaten by the Valg in his spirit form
If you need extra information
go read the Throne of Glass series by Sarah J. Maas