Skill Mastery: Astral Shift

One of the early shaman survival cooldowns that you can get at level 15 is called Astral Shift. It isn't flashy or super awesome or anything. But an emergency damage reducer on a 2-minute cooldown could be just what you need to stay alive and continue DPSing (or healing).

It doesn't reduce only magic damage.

Nor does it reduce only physical damage.

It reduces any damage!

In case you feel two minutes is too long, you have some alternatives. Nature's Guardian is an effect that can kick in once every 30 seconds, which might potentially save you (although the next hit you take could be lethal). Stone Bulwark totem is another alternative that places a shield on you which refreshes and adds additional absorb amounts every five seconds after.

The theme of the level 15 shaman talents revolves around survival and damage mitigation. Raiders may lean more toward Astral Shift, but I'm using the Stone Bulwark totem for the purposes of questing and leveling.