Tips to Beat the Astel Boss
Lion Greatbow with Radahn’s Spears.
The spears receive a 20% passive damage bonus just from holding the bow, and they do 20% more damage against Gravity type enemies (which Astel belongs to).
The strategy is pleasingly simple. You spam “Radahn’s Rain” from a safe distance and watch Astel’s HP melt like a butter on a hot pan.