Necromancer
Sesisek is a very very bitter demon. He's been assigned a position that he doesn't want, he's not liked and barely respected. And worse he can't do too much about it right now.
At one time he was Velzix's left hand demon. (Right hand would be inappropriate here) He had spies everywhere and dealt in secrets, blackmail and assassination. He made sure he didn't have to answer to anyone except Velzix, and if things had gone as planned he wouldn't have had to answer to him for too much longer either.
However a succubus called Sinthinia came along and fucked up everything for him. All his plotting, planning, and doubling dealings all came to be meaningless thanks to her actions. He had no more clout after what happened, and to add further insult Velzix allowed him to live and do menial humiliating jobs. However, Sesisek's time in the infernal plane most likely still would've been a short one as other demons would've taken revenge for his past dealings; the only thing that saved him was the Dark Order summoning to your world. As a result he was given a slight reprieve and he's even gained some of his status back since Velzix does know him to be competent and the fact that Velzix needs all the help he can get right now to get a strong foothold on your world.
He's been given a military position to keep him out of the way and preoccupied (Much like Tivadol) but due to his brethren's intense lack of respect of him, he's only leading mortal troops. He can't stand mortals and could care less if they die by the thousands, he dislikes being a military leader, (He preferred the subtle approach to power) and on top of all this his mind is constantly plagued by thoughts of revenge. All of this means his success on the battlefield is mediocre at best. He does a good enough job to make it appear like he's still useful.
He hates Sinthinia for betraying him, but even more for the fact that she was so successful at it. He hates Velzix for continuing to humiliate him. He finds Tivadol to be an idiotic brute who doesn't know shit about real power. As for you, he doesn't particularly care about you at all, except he doesn't find you to be a threat since you're a mortal. He recognizes you do have some power about you and along with being on direct speaking terms with Velzix, you speak to Sinthinia on occasion as well. He probably figures that maybe he can use you in some sort of mad plan for revenge.
It's all that drives him at point.
At one time he was Velzix's left hand demon. (Right hand would be inappropriate here) He had spies everywhere and dealt in secrets, blackmail and assassination. He made sure he didn't have to answer to anyone except Velzix, and if things had gone as planned he wouldn't have had to answer to him for too much longer either.
However a succubus called Sinthinia came along and fucked up everything for him. All his plotting, planning, and doubling dealings all came to be meaningless thanks to her actions. He had no more clout after what happened, and to add further insult Velzix allowed him to live and do menial humiliating jobs. However, Sesisek's time in the infernal plane most likely still would've been a short one as other demons would've taken revenge for his past dealings; the only thing that saved him was the Dark Order summoning to your world. As a result he was given a slight reprieve and he's even gained some of his status back since Velzix does know him to be competent and the fact that Velzix needs all the help he can get right now to get a strong foothold on your world.
He's been given a military position to keep him out of the way and preoccupied (Much like Tivadol) but due to his brethren's intense lack of respect of him, he's only leading mortal troops. He can't stand mortals and could care less if they die by the thousands, he dislikes being a military leader, (He preferred the subtle approach to power) and on top of all this his mind is constantly plagued by thoughts of revenge. All of this means his success on the battlefield is mediocre at best. He does a good enough job to make it appear like he's still useful.
He hates Sinthinia for betraying him, but even more for the fact that she was so successful at it. He hates Velzix for continuing to humiliate him. He finds Tivadol to be an idiotic brute who doesn't know shit about real power. As for you, he doesn't particularly care about you at all, except he doesn't find you to be a threat since you're a mortal. He recognizes you do have some power about you and along with being on direct speaking terms with Velzix, you speak to Sinthinia on occasion as well. He probably figures that maybe he can use you in some sort of mad plan for revenge.
It's all that drives him at point.