Orb Vallis Cave Hotspot. More specifically what do they look like in caves? This land of duality, where cold tundras made by orokin terraformation devices mix with the original harsh venusian atmosphere.
Ecosynth analyzer is a resource extracted from synathid, a servofish found in cave hotspots in orb vallis. First, the exploiter orb descends into the cave, clinging to the walls and gloating at you. You will unlock an achievement vallis spelunker for completing the following task explore all of the caves in orb vallis.
Others are unlocked temporarily when you capture corpus outpost.
Certain locations in orb vallis have different toroids drop from enemies and a few bosses drop specific toroids as well. Like in the plains of eidolon, in the orb vallis you can find both. Not necessary but will help: All warframe parts and where to get them.