Finn Harps produced their biggest League of Ireland win in over three years to preserve their Premier Division status, while Shamrock Rovers were presented with the Division's trophy after a 2-1 win at home to Drogheda on Friday.
Harps thrashed Longford 5-0 in Ballybofey this evening to end the season safe in eighth position.
Waterford will play UCD in the promotion-relegation playoff.
Meanwhile, the Blues drew 0-0 with St Pat’s to finish second-from-bottom in the table in tonight’s final round of SSE Airtricity Premier Division games.
Colm Whelan’s 24th goal of the season helped UCD to a 2-0 win over Bray in the First Division playoff final at Dalymount.
Derry secured fourth spot in the table - and a potential return to Europe - via a 2-1 win at Dundalk.
Bohemians' 1-1 draw at Sligo leaves them fifth, and the side must now win the FAI Cup next week to secure European football.