Giant 2,500-capacity night spot with dance music, state-of-the-art sound & an underground club room. ONYX opened up in 2014 in RCA and by 2017 the club made it onto DJ Mag’s Top 100 Clubs list, coming in at number 71 – the only Bangkok club to have ever. Book a VIP table at Onyx Club in RCA now. Onyx is Bangkok most popular electro club and the best place to party with sexy Thai girls in RCA.