Have you considered mastering all the classes you already are before fighting Algus? Algus sucks in battle as long as you have your good friend speed. I suggest taking out the wizards or healing yourself in between their attacks. Wizards and Knights make Algus seem like Velius in times, but still, bring a few mized classes with nearly unbeatable combos like Blade Grasp for the knights, Magic Defend UP for the wizards, or Arrow Guard on Algus, or break his weapon to make things easier. Basic combos include Yell, and Speed Save, if your an archer. I can name alot more but time is money, right? I wish you luck.