As much as I want the quest to end as soon as possible, I don't want to risk too much when it comes to facing Lemis. She is very powerful on her own due to her ability to seal skills and to cause corrosion. She can even manipulate minds and can temporarily control you if your will is not strong enough or your cleric is incompetent in clearing debuffs.
Since Remis is killed, I doubt Lemis will just sit there and do nothing. She is a high-ranking demon and if she can disrupt the Insect Kingdom easily, she can do that again. Aside from that, there is also the matter of the Weapon of Pride. If my assumption is correct, she is going to control the king and use the power of the Weapon of Pride to deal with us.