Aslan has already seen his success rate. It's safe to say it's not that high, if he fights alone there is a high chance of not losing. However if he wants he can increase his Chance of winning since there is improvement and movement skill that will increase his total strength and movement speed greatly . But for now he doesn't want to use those skills. He wants to push himself and see how far he can go. After thinking all of this, Aslan directly Asked the system about the boss monster weakness.
" Shamans use their staff to cast skill, all we have to do is just destroy the staff of the shaman, then we can easily stop The shaman from reinforcing the ogre and take care of them without much " Aslan answered after pushed