You will also notice that if a Hex requires more Intelligence than Faith, you would need a Staff to cast that spell, and if it requires more Faith than Intelligence it would require you to equip it on a Chime. The damage of Hexes are influenced by dark elemental damage.
Most Hexes would also require more than one attunement slot. Hexes are spells that are somehow difficult to incorporate to some builds as it is unique in a way that it would require both Faith and Intelligence in order to be used, as well as having high stat requirements.
Hexes are a type of Magic that offer offensive and self-buff spells.