Shockwave is one of the 7 elemental damage types.

Shockwave is the racial damage type of the Tryker. The shockwave damage elemental spell can only be learned from a Tryker magic trainer once a mage reaches level 125. It is generally the preferred damage type to use while in the lakelands.

Tryker player characters have a natural 20% protection against Shockwave damage.

To increase your chances of resisting a Shockwave elemental spell, you have to wear jewelry that raises your Lakelands resistance.

Psykopla and Jubla are capable of casting Shockwave elemental spells.

Yber are capable of naturally unleashing an attack that does Shockwave damage, though the attack itself is physical and not magical in nature. That means Shockwave protection will protect you against it, but Lakelands resistance will not help you resist it.