This comes from tbc, as current resto capstone talent isn't much useful for both pvp and pve, my proposal is to change capstone talent for:
Nature's Guardian
Talent
Whenever a damaging attack is taken that reduces you below 30% health, you have a 50% chance to heal 10% of your total health and reduce your threat level on that target. 5 second cooldown.
(Proc chance: 50%, 5s cooldown)