At SummerSlam, Los Boricuas defeated The Disciples of Apocalypse. In the first singles match between former Nation members, Vega fought Crush to a no contest. At Ground Zero: In Your House on September 7, he defeated Faarooq and Crush in triple threat match. At the UK-exclusive pay-per-view, One Night Only, Vega and Pérez unsuccessfully challenged The Headbangers for the WWF World Tag Team Championship. At Badd Blood: In Your House, The Disciples defeated Los Boricuas. Between October and November, Vega also had singles matches, losing to Goldust, Mero and Ken Shamrock. On the October 27 RAW, Vega and Pérez unsuccessfully challenged The Legion of Doom for the Tag Team Championship. In their next match, they lost to The New Age Outlaws. In December 1997, Los Boricuas and The Disciples exchanged victories. His first singles contest of 1998 was a loss to Owen Hart. The next week, Vega and Pérez defeated Taka Michinoku and Scott Taylor. He was the 26th entrant in the 1998 Royal Rumble, and, like the year before, was eliminated by Steve Austin. In the Royal Rumble's main event, Vega and Los Boricuas attacked the Undertaker alongside the New Age Outlaws to aid Shawn Michaels in defeating him in a casket match. Vega headlined No Way Out of Texas: In Your House on February, when he replaced the injured Shawn Michaels in the eight-man tag main event, teaming with Triple H and the New Age Outlaws in a losing effort. On the March 9 Raw, he wrestled Triple H to a no contest. At WrestleMania 14, Vega wrestled in a battle royal, won by Legion of Doom 2000. A week later, Los Boricuas lost to LOD 2000. The Gang Wars continued with matches against The Disciples in April. On May 4, Rivera lost to the NWA World Champion, Dan Severn. The Gang Wars came to an end when the leaders of the three stables faced off in a triple threat match, which Vega won. After the angle, Los Boricuas splintered into two tag teams. On July 6, Vega defeated Brakkus in a Brawl for All tournament boxing match. On August 10, he lost a quarterfinal match to Darren Drozdov. As a result of a severe arm injuryand was released in A ugust 1998. Vega returned to WWF television in July 1999. He would make a number of appearances on WWF Super Astros, and would participate in WWF Shotgun