Why is a 0 requirement helm best in slot magic defence

Why is a 0 requirement helm best in slot magic defence helm slot osrs OSRS - Inferno OSRS - The Dark Beast Sotetseg helm slot slot) or archer Then use a blessed coif or ranger helm for your helm slot as the slayer helm's bonuses are for melee only

afx slot car New, up-to-date and accurate OSRS Ranged Max Hit Calc Blowpipe, dragon Head No head, Crystal helm , Masori mask , Slayer helmet Black