Norwich were crowned champions while Sheffield Wednesday survived to set up a grandstand finish on the penultimate weekend of action in the Sky Bet Championship.
With promotion already sealed, Daniel Farke's Canaries were in celebratory mood as they thumped Reading 4-1 at Carrow Road despite falling behind to Josh Laurent's 12th minute header.
Kieran Dowell's double either side of the interval and late strikes from Xavier Quintilla and Teemu Pukki sealed the hosts' coronation in style.
Norwich City were crowned champions of the Sky Bet Championship after beating ReadingInsurance Loans Mortgage Attorney Credit Lawyer
With promotion already sealed, Daniel Farke's Canaries were in celebratory mood
But the real action was at the bottom of the table where Wednesday's goalless draw in the early kick-off against Nottingham Forest meant they would be relegated if Derby secured at least a point at Swansea.
But Wayne Rooney's men slumped to a 2-1 defeat - their sixth in a row - setting up a crunch Pride Park clash between the Rams and Wednesday next weekend, when the visitors must win to stand a chance of staying up.
Derby led through a 48th-minute header from Tom Lawrence but Morgan Whittaker levelled just past the hour mark and Connor Roberts struck the winner three minutes later for the Welsh side.
Sheffield Wednesday's draw against Nottingham Forest meant they would be relegated if Derby drew
The relegation conundrum is further complicated by Rotherham, who boosted their hopes of staying up after Lewis Wing's late equaliser in a 1-1 with Blackburn.
The point for the Millers, after Adam Armstrong's early goal for the visitors, means their own fate is back in their own hands, although they need at least three points from their last two away games at Luton and Cardiff to stand any chance.
Uche Ikpeazu's fourth-minute effort gave Wycombe a 1-0 win over Bournemouth and ensured Gareth Ainsworth's men also avoided relegation, although they need a mathematical miracle to extend their stay in the second tier.Insurance Loans Mortgage Attorney Credit Lawyer
But Wayne Rooney's men slumped to a 2-1 defeat - their sixth in a row - against Swansea
Hull claimed the Sky Bet League One title with a 3-1 home win over Wigan, while Peterborough fought back to draw 3-3 against rivals Lincoln and secure their own promotion.
The Tigers - already made sure of their place back in the Championship after beating Lincoln last weekend - went in front through Keane Lewis-Potter's header in the 17th minute, but Joe Dodoo soon had Wigan level.
Hull, though, were back in front again in the 22nd minute through George Honeyman and Josh Magennis wrapped things up with a third in the second half.
Hull claimed the Sky Bet League One title with a 3-1 home win over Wigan
The Tigers made sure of their place back in the Championship after beating Lincoln last weekend
Peterborough fought back from 3-0 down to grab a dramatic draw and secure promotion with a penalty from Jonson Clarke-Harris deep into stoppage time.
Imps midfielder Anthony Scully broke the deadlock on the half-hour, with Jorge Grant adding another from the penalty spot just before half-time.
Scully got his second in the 53rd minute to seemingly leave Posh's promotion party on hold.
However, Siriki Dembele started the fightback before Clarke-Harris set up a tense finale with a 75th-minute free-kick - and then kept his cool from the penalty spot deep into stoppage time.
At the other end of