Minecraft wiki entry for Strider, associated text: Striders are damaged by water, rain, and splash water bottles, which deal damage by 1 per splash water bottle or half-second in water or rain, which can kill them. While in water, they slowly sink while taking damage. Striders still take damage from rain even if they are in lava. However, they are not harmed when standing in a filled cauldron. They also cannot be harmed by snowfall or snowballs. They take extra damage from freezing in powder snow.