Passive:

After casting three abilities, [Protea] empowers her next ability cast with an additive 100% Ability Strength bonus

Just imagine, You cast Dispensary, then you cast Nourish, then Grenade Fan and the next ability going to be empowered with +100% Strength.
Aura:

Growing Power, because You want all Strength You can get

Exilus:

NONE - You don't really need anything out there...
[\[Primed Sure Footed\]](/items/arsenal/801/primed-sure-footed/), You can't crush Your enemies with her butt, so focus on her higher survivability
[\[Power Drift\]](/items/arsenal/67/power-drift/), because You want all Strength You can get

Mods & Stats:

Every Strength mod is here to hit hard and increase Damage and Extra Pickup Drop Chance
High Range gives You a lot of maneuvering space and gives Your skills a larger guidance area
Keep Your Duration as high as possible, this will give You more time to collect Energy Orbs and all Your skills more effective
lowered to the bottom Efficiency should not be a problem, You got Your own Energy Orbs Dispenser, and thanks to Nourish, better Energy Multiplier
You don't care about [\[Archon Vitality\]](/items/arsenal/5924/archon-vitality/) Rank, You use it only for its Bonus
[\[Rolling Guard\]](/items/arsenal/1430/rolling-guard/) is here in case when shit hit the fan, dodge and find save place

Arcanes:

Energize: Energy replenish on Energy Orb pickup, 15s cooldown
Eruption: knockdown on Energy Orb pickup
Molt Augmented: up to +60% Strength on kill
Molt Efficiency: up to 36% Duration over a period of time while Shields are active

Archon Shards:

Crimson Archon Shards (RED): +10% (+15%) Ability Strength or +10% (+15%) Ability Duration
Amber Archon Shards (YELLOW): any but Parkour Velocity, +25% (+37.5%) Casting Speed is always welcome
Azure Archon Shards (BLUE): none

Focus School:

Zenurik for Energy Replenish
Madurai for its Power Transfer and Sling Strength
Vazarin for its Void Snare and Protective Sling

Any other Focus School for whatever reason you want to achieve