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A device of undetermined function and origin. Prized by Vox Solaris and the Quills.
—In-game description for all Toroid variants
Toroids are rare resources that can be acquired from enemies or in caves as a rare item in Orb Vallis. Presumably the power sources for various CorpusRaknoids on the Vallis, these items act as either a normal pickup when dropped by enemies, or as an interactable object if found in caves. Just like Sentient Cores are traded with The Quills, all Toroids can be traded with Vox Solaris.
The components of Garuda, Baruuk, and Hildryn require Toroids to craft. Specific Toroids and their values, along with additional recipes that require them can be found on the Toroids' respective pages.
Vega Toroid, Calda Toroid and Sola Toroid can be traded for 1,000 Standing 1,000 each with Vox Solaris.
Crisma Toroid can be traded for 6,000 Standing 6,000.
Lazulite Toroid can be traded for 12,000 Standing 12,000.
Vega Toroid: Drops from enemies around/inside the Spaceport. Has a 1% chance to drop from Mite Raknoids.
A large number of Mite Raknoids will spawn during the first stage of Exploiter Orb whenever she moves across the battlefield
Calda Toroid: Drops from enemies around/inside the Enrichment Labs. Has a 20% chance to drop from Scyto Raknoid.
Doing all of a Profit Taker Phase 2 bounty but not turning it in will endlessly spawn Corpus dropships. You don't even need to let the beacons hit Alert Level 4 since the drop ships will bring plenty of enemies.
Sola Toroid - Drops from enemies around/inside the Temple of Profit. Has a 20% chance to drop from Kyta Raknoids.
Go inside the target area. Try to get one of the enemies to put down a Reinforcement Beacon. Wait until the beacon hits Alert Level 4. From this point, unlimited enemies will spawn. They will increase in level very quickly, but will eventually hit a level cap that is based on the bounty tier, and stop increasing further.
Vega, Calda, and Sola Toroids can also be found as interactable pick-ups, similar to Ayatan Sculptures, in the many (17) caves throughout Orb Vallis.
17 confirmed spots by visual observation. All of them are located in secluded part of caves, unlike Tepa Nodule which can be found all over the caves.
Possible number of Toroids spawned per run is zero to seven, 2-4 as average chance.
In concept art, Toroids are referred to as "Arachnoid Power Cells"
It could be speculated that toroids are Corpus-modified or synthetic sentient cores, giving raknoids sentience while still being subservient to the Corpus. This would explain the Quills interest in these devices and the Profit-Taker and Exploiter Orb's ability to speak and think.
In real life, toroidal transformers are pairs of donut-shaped, magnetic rings wrapped in wire used to increase or decrease voltage. In the same vein, toroids could be responsible for generating the advanced shields utilized by raknoids.
How to Farm Toroids! Fortuna & Orb Vallis (Warframe)