Aidan O'Brien enjoyed a double under the lights at Dundalk, completed by Ineffable in the Download The Titanbet Sports App Handicap.
The Ballydoyle handler was also represented by market leader Stone Mountain, as well as Dancing On Air, but Michael Hussey was allowed to bowl along in front on 10-1 chance Ineffable.
Plenty queued up to challenge in the straight, but Ineffable held them all at bay and beat Lex Talionis by a short head.
Joseph O'Brien, representing his father, said: "He'd a great run the last day. Stone Mountain went up 7lb, and this horse was getting a lot of weight today. Mick gave him a great ride.
"I think he'll handle grass, and he stays well."
Ineffable's stable companion Sea Of Blue (9-1) went into the Titanbet.co.uk Handicap as a 15-race maiden and only made it off the reserves' bench when Rock On Rosie was pulled out, but showed a pleasing attitude for Seamie Heffernan to score by two lengths.