Ulster saw out the final 10 minutes with 13 men to inflict a four-try defeat on a beleaguered Dragons side.
Newcastle Falcons closed the gap on second-bottom Worcester Warriors to five points with a 17-6 victory in the Premiership on Sunday.
Bill Beaumont will chair a meeting in Dublin this month to discuss plans for a new annual 12-team global competition.
A late rally away to Jaguares was not enough for the Blues to avoid suffering a third successive Super Rugby defeat.
Toulouse's lead in the Top 14 table is down to a solitary point after Clermont Auvergne thrashed Grenoble. Lyon, meanwhile, lost at home.
Wales international Leigh Halfpenny featured in the Scarlets' 10-6 win over Munster, while Glasgow Warriors went top of Conference A.
Saracens eased past Northampton Saints but table-topping Exeter Chiefs had to repel a second-half rally from Sale Sharks.
Handre Pollard scored 20 points with his boot as the Bulls tamed the Lions, while the Sharks tasted defeat for the first time this...
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The Sunwolves rocked the Chiefs to claim their first away Super Rugby victory and the Crusaders were too strong for the Reds.
Tributes have been paid to Michael Tamoaieta after the Blues forward passed away suddenly.
Gloucester let Friday's Premiership match slip through their fingers late on at Bristol Bears.
A 15th Pro14 win of the season was enough for Leinster to make sure they will be at home in the semi-finals this term.
Joe Schmidt says Johnny Sexton and Joey Carbery should recover from injuries in time to take on France in Dublin.
Ngani Laumape tormented the Brumbies as the Hurricanes dished out a hammering, while the Rebels made it two wins out of two.
World Rugby's proposed changed to the international calendar have not gone down well with top players.
Mark McCall hailed Schalk Burger as "one of rugby's truly great players" after the back-row decided to return to South Africa.