The WS quest has nothing to do with Ergon. To start the Ergon quest you need Legend status in all coalitions and all of the GEO AF quests. Doing that and talking to Nhili Uvolep will start the quest.
Phase 1: Go to Dho Gates (F-12), click the spot near the water and get a Rusted Handbell. Go back to town and talk to Nhili.
Phase 2: Talk to Runje Desaali at Eastern Adoulin (J-10) to start the repair process, trade Geosuke (the Leafkin) 100 H-P Bayld and return to Nhili.
Phase 3: Go to Dho Gates (H-7) and click the Water of Whispers to enter a SJ-locked BCNM against a Bygone Geomancer. Win the fight for a CS and a KI. Return to Nhili and get a Nodal Wand. Take the wand to Runje and start the upgrade process: 200 Ghastly Stone, Rockfin Tooth, Gabbrath Meat, and 500 H-P Bayld. Once that's all turned in, you'll get a KI. Go back to Dho Gates and trade your wand to the Prominence of the Ripple Locus at (E-10) to upgrade the wand.
Phase 4: Trade the wand to Runje and start the next upgrade process. This time you need 200 Verdigris Stones, Waktza Crest, Yggdreant Bole, Cehuetzi Pelt and 2500 H-P Bayld. Turn those in for another KI. Trade the wand to the Moh Gates Prominence of the Flames Locus at (K-10) to upgrade the wand.
Phase 5: Trade the wand to Runje and start the final upgrade process. This time you need 200 Wailing Stones, a Pristine Yggrete Crystal (2.5 million plasm from the Inventor's Coalition) and 9999 H-P Bayld. Turn that in for the final KI. Trade the wand to the Sih Gates Prominence of the Gales Locus at (J-11) and get Idris.
It's easy! Really!