Survival
Though your main survival will come from other sources like a healing melee, health gate with [Panzer Vulpaphyla], and additional invulnerability and healing with vazarin protective dash and more healing with magus elevate this serves as the icing on the cake.

Decaying dragon Key- Smaller shield pool to fill faster and get a full shield gate
Brief respite- Cast 3 to recover shields during shield gate
Rolling guard- Go invulnerable when shields are broke and cleanse status

Crowd Control
With high range your 4 will hit many enemies stunning them and giving you a high chance to get your energy back ([Exothermic] augment) , also working with your passive to give you additional ability strength.

Armor Strip
With high efficiency you can repeated cast your 4 to accelerate your immolation and 3 at max immolation to strip armor. With a 43m radius on your 3 you will be armor stripping the whole room.

Brief respite- use abilities to recover shield and abuse shield gate

Prime sure footed- Not 100% mandatory will prevent knockdown from enemies, I mainly use because I use weapons with knock back
like kuva Zarr

Primed Flow- Larger energy pool since Embers gameplay revolves around repeatedly casting abilities

Streamline- efficiency to cast 3 and 4

Exothermic- enemies hit by 4 have 15% to drop energy when killed helping you maintain your energy

Rolling guard- Go invulnerable to replenish shields and cleanse status

Fleeting expertise- more efficiency to cast 3 and 4 !!DO NOT UPGRADE PAST RANK 3!! efficiency cap is 175 you will be decreasing your duration with no benefit. If its already maxed from a different build replace natural talent with continuity

auger reach- more range for 4 and more shields from abilities

stretch- more range for 3 and 4

natural talent- utility faster casting faster shield recovery feel free to replace if you want something else

arcane energize- helps with maintaining energy

arcane resistance- no toxin procs I put this here because i did not know what else to use arcane nullify or whatever you want

Pros of this build
Survival with shield gate

Crowd control with high range on 4

Armor strip with high range on 3

Cons of this build
[Exothermic] on grants 15% energy chance to enemies killed WHILE affected by your 4
Because of low duration your 4 only last 9 seconds if you cant kill the enemies in that time use [Continuity] for and addition 4 seconds making the duration last 13 seconds
sure you could always recast 4 but I feel like its wasting energy