User blog comment:Care Level/RE: PBE Riven Nerf/@comment-5342720-20131219034241/@comment-4022742-20131219145747

If you'd built enough damage the shield would scale with it and you'd be invulnerable for that 2,5 seconds on the shield. You know what else does that? Kayle's ultimate. Which is an ULTIMATE ABILITY and has 60 seconds COOL DOWN. You can't have a champion possess the equivalent of that same skill under a button that recharges every 10 seconds. It was too strong and deserved a downright nerf.