Guardian

Guardian lets a Sentinel, MOA or Hound refill its owner's shield once it is depleted. The effect has a 30 second cooldown, and it also grants the companion some affinity when it triggers.

The mod drops from enemies and can also come from transmutation. Manifold Bond helps by shortening the cooldown so the shield refill is ready again sooner, which makes it a decent safety net for squishier frames.

Guardian was added with Update 7.0 (March 2013).

Guardian is tradable, see the current prices in the market box above.