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However, realizing such extreme confinement in a stable and controllable manner remains a key challenge. Here, we introduce a van der Waals material\u2010based nano\u2010cQED platform by coupling monolayer  excitons to plasmonic sub\u2010nanocavities formed via assembly of ultrasmall gold clusters (3\u20135 nm) in the nanogap of a nanoparticle\u2010on\u2010mirror nanocavity. These clusters emulate the field\u2010confining role of atomic protrusions of the picocavities through a resonance\u2010insensitive lightning\u2010rod effect, achieving deep\u2010subwavelength mode volumes. In this nano\u2010cQED testbed, we observe pronounced multi\u2010branch Rabi splittings ( meV, ) and ultrastrong lower\u2010branch polaritonic photoluminescence with up to 10\u2010fold enhancement. This architecture provides a controllable pathway to access picocavity\u2010like behavior and opens new opportunities for single\u2010molecule spectroscopy and the exploration of\u00a0nano\u2010cQED.<\/jats:p>","DOI":"10.1002\/advs.202523335","type":"journal-article","created":{"date-parts":[[2026,5,19]],"date-time":"2026-05-19T14:27:58Z","timestamp":1779200878000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Extreme Polaritonic Interactions in a Room\u2010Temperature Designable Sub\u2010Nanocavity Quantum Electrodynamic Platform"],"prefix":"10.1002","volume":"13","author":[{"given":"Huatian","family":"Hu","sequence":"first","affiliation":[{"name":"Hubei Key Laboratory of Optical Information and Pattern Recognition Wuhan Institute of Technology Wuhan China"},{"name":"Istituto Italiano di Tecnologia Center for Biomolecular Nanotechnologies Arnesano 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