The combat system is fairly level dependent; if you rush through to the main plot quests you are probably going to have problems, though there are various strategies that can help. If you explore everywhere and delay doing what you are told to do by the dragon slayer or dragon knight, then you shouldn't have a problem.
Other than leaving (via the teleporter shrine) to level up a bit, you should do better against him if you are playing a warrior to Rush Attack, and get him switched to a sword rather then a bow. For archers or mages, I did happen upon a spot before the rise in the dragon spine path where I could stand and target Amdusias, but most of his arrows were blocked. Several people playing mages have run behind the blood alter, where he doesn't follow, and popped out just long enough to cast spells, then retreated for the cooldown time or to heal.
The creature and/or summons, if available, could help.
How to defeat Amdusias?AmdusiasKilling Amdusias! >.<Welcome to the forum.
