Necromancer

Tivadol is a typical "rank and file" demon. Brutal, violent, sadistic, full of hate, and wants everything his way and decides the best way of getting it is to smash somebody over the head and take it. The only thing that makes him slightly different is he's a bit more intelligent and has a burning desire to be in charge of everything. This is what makes him a good general.
It's also what makes him a threat to Velzix. Tivadol barely contains the fact that he wants to take over Velzix's position one day. This attitude is probably why he's put on the frontlines and leading the most dangerous attacks. If he wins Velzix gains more territory, if he dies, then that's good too!
Tivadol knows this of course and decided that he shall gain more respect in displaying that he's a battlefield general rather than an armchair one. Then when the time is right, he'll take Velzix's throne by storm. A simple and short sighted plan. One that will probably not come to pass as Velzix is too intelligent to be overthrown by a straightforward coup. Tivadol might be successful if he employed a little subterfuge, but he doesn't have the patience for it. This is another reason why Tivadol wants Sinthinia on his side (Besides her obvious physical qualities of course) since she could take care of such things. So far he's been unsuccessful in convincing her.
He doesn't respect Sesisek (Considers him to be a fool who allowed himself to lose his status and never liked him to begin with) and respects you even less. As you are a mortal, he doesn't even know why Velzix deals with you and sees this as a weakness in him. The fact that you have great power of the dead doesn't impress him. He just sees you as another weak mortal that will have to be crushed when he takes power sooner or later.
And if he gets his way, sooner.
It's also what makes him a threat to Velzix. Tivadol barely contains the fact that he wants to take over Velzix's position one day. This attitude is probably why he's put on the frontlines and leading the most dangerous attacks. If he wins Velzix gains more territory, if he dies, then that's good too!
Tivadol knows this of course and decided that he shall gain more respect in displaying that he's a battlefield general rather than an armchair one. Then when the time is right, he'll take Velzix's throne by storm. A simple and short sighted plan. One that will probably not come to pass as Velzix is too intelligent to be overthrown by a straightforward coup. Tivadol might be successful if he employed a little subterfuge, but he doesn't have the patience for it. This is another reason why Tivadol wants Sinthinia on his side (Besides her obvious physical qualities of course) since she could take care of such things. So far he's been unsuccessful in convincing her.
He doesn't respect Sesisek (Considers him to be a fool who allowed himself to lose his status and never liked him to begin with) and respects you even less. As you are a mortal, he doesn't even know why Velzix deals with you and sees this as a weakness in him. The fact that you have great power of the dead doesn't impress him. He just sees you as another weak mortal that will have to be crushed when he takes power sooner or later.
And if he gets his way, sooner.