Fortifying Brew is one of our major defensives. With Expeditious Fortification it's a 1.5 minute cooldown and gives us additional health which can buff things like Life Cocoon and Chi Cocoon as they scale off of our health pool.
Diffuse Magic is a 60% damage reduction against Magic abilities which makes it extremely strong for some mechanics but will not work for Physical damage so it's important to know what type of damage you're taking when planning defensive use.
In addition to this being a major defensive, Diffuse Magic is also a pseudo-spell reflect that can be used on certain bosses and trash packs to get a lot more damage out of our toolkit. The impact of the reflect interaction depends on the dungeon pool and it a spell-by-spell basis but in the past the diffusable debuffs have been very strong!
Mentioned above as a cooldown but it can also be used as a personal defensive if needed. Life Cocoon is a large absorb (when talented into Calming Coalescence) that can be used on anyone, even your tank. Often times Life Cocoon is used to prevent one shots on dps players, to remove one player from your triage during heavy AOE damage, or on a tank to help them cycle their defensives better.
Chi Cocoon is a 12% HP + Versatility shield proc when we Invoke Chi-ji, the Red Crane or use Expel Harm with Thunder Focus Tea.
The Chi Cocoon from Chi-ji is a 5 target shield proc and when used with Expel Harm it is a personal shield only.
Jadefire Teachings is a talent to buff Ancient Teachings but this also gives it 5% Stamina. Your uptime on Ancient Teachings should be very high anyway but occasionally the 5% can be enough to prevent a one shot.
This also makes things like Life Cocoon and Chi Cocoon bigger as they scale off of our health pool.
Jade Sanctuary is a talent in our Conduit of the Celestials hero talents which gives a 15% damage reduction during Celestial Conduit and for 8 seconds after the channel ends. This allows Celestial Conduit to be used as both a defensive and a healing cooldown.
Elusive Mists is tied to Soothing Mist and gives a small amount of damage reduction to yourself and your target. This is another tool that can help prevent one shots or just lessen the damage from a heavy hitting ability or DoT.
Dance of the Wind is a passive talent in the class tree that gives up to 90% reduced Physical damage taken for one hit: 10% from the base talent plus the stacking 10% up to 9 stacks.
This has insane value in certain dungeons but can also be a life saver from a stray melee or randomly targetted ability. It's a good idea to track your stacks so you know your DR amount, as this can help you decide whether or not you need to send a defensive or if Dance of the Wind can be your defensive.