A hoary steed's natural weapons are treated as magic for the purpose of overcoming damage reduction.
Astral Projection and Etherealness (Su): These abilities function just like the spells of the same names as cast by a 20th-level caster.
Magic Circle Against Good (Su): This ability continuously duplicates the effects of the spell. A hoary steed cannot suppress this ability.
Immunities (Ex): A hoary steed is immune to all charm and hold spells or abilities.