how exactly does protea shield's work?

[_Anise_]

I saw someone using a dragon key on an unrelated mission, how exactly does protea shields work and why would running a dragonkey make her better?

 

ps:is she anygood for steel path ? how does she survive the insane amounts of damage?

[(PSN)zenhumphrey]

People run a specific dragon key "decaying dragon key" that lowers shield values, it makes shields regenerate to 100% much faster so the warframes can get the full effect of shield gating.
Protea will throw 4 balls that a player can pick up, these balls will regenerate shields and will instantly re fill a player's shields, this effect will be gone if the player loses 100% of their shields or their duration is over, this ability is affected by power strength and duration.

[(PSN)zenhumphrey]

15 minutes ago, _Anise_ said:

 

 

ps:is she anygood for steel path ? how does she survive the insane amounts of damage?

Shield gating is a very reliable way to survive so warframes like mag, hildryn, harrow and protea can survive by relying on shields alone.
If you forgot or don't know how shield gating works: if a player has full shields then losing all of those shields will give a warframe 1.3 seconds of invulnerability, if shields get depleted when regenerating then the player only gets 0.33s (iirc) of invulnerability, this is why shield warframes like protea is able to take enormous damage.