Kidderminster Harriers had Anthony Malbon stretchered off as they missed out on the Blue Square Bet Premier play-offs for the second year running.
Harriers needed to win and hope that rivals Luton slipped up at Fleetwood.
But Lee Vaughan was sent off just after the break for an elbow on Matt Rhead.
Five minutes later, the Stags cashed in when Lee Stevenson fired home a low shot before Louis Briscoe wrapped it up, heading home Andy Todd's cross, Matt Green adding a late third.
Briscoe - sent off against Kidderminster earlier in the season - was the man involved in the serious incident involving young striker Malbon.
The Stags striker was booked for his heavy challenge on Malbon which left his opponent knocked out cold and having to undergo nine minutes of treatment.
He was stretchered off before being airlifted to hospital by helicopter after the game, suffering from suspected concussion.
Referee Jez Simpson blew for full-time a few minutes early to allow Malbon to be picked up from the Aggborough pitch by the air ambulance.
Briscoe, perhaps fortunate to be allowed to stay on the pitch, hit third-placed Mansfield's second before Ryan Rowe hit the post for the home side.
Green completed Harriers' misery when he fired home a low shot on 86 minutes.
Harriers' hopes always looked bleak once news had filtered though of Luton's early goal at Highbury.
But defeat, triggered by Vaughan's second dismissal of the season, coupled with Luton's eventual 2-0 victory at Fleetwood, ensures that Steve Burr's men finished sixth for the second year running.
VIEW FROM THE TRAINING GROUND
Kidderminster assistant manager Gary Whild told BBC Hereford & Worcester:
"Losing is a disappointment but overall, across the whole season, to finish sixth again is a fantastic achievement.
"You only have to look at the clubs in the play-offs, they're massive clubs. For us to be taking them all the way, with our resources, the gaffer has done an absolutely fantastic job.
"It's great to come as far as we have with a young bunch of players who'll be a lot better for the experience they've had this season."
Mansfield Town manager Paul Cox told BBC Radio Nottingham:
"Anybody that's picked to put a Mansfield Town shirt on now is expected to have a winning mentality.
"We want a squad of 22 players who're all chomping at the bit to get in the first 11 and nobody in the first 11 can rest on their laurels.
"The lads out there today were a different level, even right at the end when they could have took their foot off the pedal. But we kept going, It's just a tremendous group to work with and manage."
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Live Text Commentary
Full Time The referee ends the match.90:00 +5:58
Effort on goal by Jack Byrne from outside the penalty box goes harmlessly over the bar.90:00 +5:21
Matt Rhead crosses the ball, save by Tony Breeden.90:00 +3:54
Lee Stevenson has an effort at goal from outside the box which goes wide left of the goal.90:00 +3:22
Marvin Johnson produces a cross, blocked by Martin Riley.90:00 +3:05
Matt Rhead takes a shot. Save by Tony Breeden.90:00 +1:32
Inswinging corner taken left-footed by Marvin Johnson, Header from close range by Luke Jones clears the bar.90:00 +0:33
Free kick awarded for an unfair challenge on Martin Riley by Marvin Johnson. Shane Redmond restarts play with the free kick.88:57
Daniel Bradley has an effort at goal from long range that goes wide left.87:28
The ball is crossed by Marvin Johnson, save by Shane Redmond.86:13 Goal scored
Goal! - Matthew Green - Kidderm'er 0 - 3 Mansfield Matthew Green gets on the score sheet with a goal from inside the area low into the middle of the goal. Kidderminster 0-3 Mansfield.85:33
Ryan Rowe takes a shot. Save by Shane Redmond.85:02
Matt Rhead concedes a free kick for a foul on Tom Marshall. Direct free kick taken by Tom Marshall.84:36
Marvin Johnson takes a shot. Save by Shane Redmond.84:20
Centre by Gary Roberts, save by Tony Breeden.83:45
Free kick awarded for a foul by Tom Marshall on Matt Rhead. Jonathan Worthington takes the free kick.81:54 Substitution
Substitution Matthew Green is brought on as a substitute for Danny Andrew.81:17
Inswinging corner taken by Marvin Johnson from the right by-line.79:54
Ryan Rowe takes a shot from inside the six-yard box that hits the post.78:52 Substitution
Substitution Louis Briscoe leaves the field to be replaced by Ben Hutchinson.
Assist on the goal came from Matt Rhead.77:29 Goal scored
Goal! - Louis Briscoe - Kidderm'er 0 - 2 Mansfield Louis Briscoe finds the net with a headed goal from close in. Kidderminster 0-2 Mansfield.77:28
A cross is delivered by Matt Rhead,76:21
Andy Todd takes a shot. Tom Marshall gets a block in.75:28
Jack Byrne delivers the ball.75:07
The ball is crossed by Ryan Rowe, John Thompson makes a clearance.74:22
A cross is delivered by Marvin Johnson, Danny Andrew manages to make a clearance.73:32
Tony Breeden restarts play with the free kick.73:32 Booking
Booking Caution for Matt Rhead.73:22
Matt Rhead challenges Luke Jones unfairly and gives away a free kick.72:32 Substitution
Substitution Ritchie Sutton is brought on as a substitute for Luke O'Neill.72:02
A cross is delivered by Luke O'Neill, Tom Marshall manages to make a clearance.69:54
Inswinging corner taken right-footed by Nick Wright.63:33
Marvin Johnson delivers the ball from the free kick left-footed from right wing, save made by Shane Redmond.63:33 Substitution
Substitution Nick Wright on for Anthony Malbon.63:33 Booking
Booking The referee shows Louis Briscoe a yellow card.63:31
Unfair challenge on Anthony Malbon by Louis Briscoe results in a free kick.62:29 Substitution
Substitution Daniel Bradley on for Kyle Storer.62:00
Matt Rhead takes a shot. Tony Breeden makes a save.61:18
Effort on goal by Marvin Johnson from outside the penalty box goes harmlessly over the bar.59:17
Inswinging corner taken by Marvin Johnson from the right by-line, Header from deep inside the area by Luke Jones goes harmlessly over the crossbar.59:06
Anthony Malbon delivers the ball, Martin Riley manages to make a clearance.58:28
The referee penalises Anthony Malbon for handball. Free kick taken by John Thompson.57:51 Booking
Booking Marvin Johnson booked.57:23
Corner taken by Marvin Johnson from the left by-line played to the near post, Louis Briscoe manages to make a clearance.57:09
Marvin Johnson takes a shot. Save by Shane Redmond.55:59
The assist for the goal came from Matt Rhead.55:59 Goal scored
Goal! - Lee Stevenson - Kidderm'er 0 - 1 Mansfield Lee Stevenson finds the net with a goal from inside the penalty area to the bottom right corner of the goal. Kidderminster 0-1 Mansfield.55:17
Jack Byrne concedes a free kick for a foul on Gary Roberts. Gary Roberts takes the free kick.54:28
Matt Rhead concedes a free kick for a foul on Tom Marshall. Direct free kick taken by Tony Breeden.54:10
Jack Byrne challenges Gary Roberts unfairly and gives away a free kick. Free kick taken by Danny Andrew.52:42
Marvin Johnson gives away a free kick for an unfair challenge on Luke O'Neill. Shane Redmond takes the direct free kick.51:02 Substitution
Substitution Dave Hankin leaves the field to be replaced by Jack Byrne.50:14
Lee Stevenson takes a shot. Save made by Tony Breeden.49:56
The official flags Ryan Rowe offside. Free kick taken by Martin Riley.47:49
Danny Andrew takes the direct free kick.47:49 Dismissal
Dismissal The referee red cards Lee Vaughan for violent conduct.47:48
Lee Vaughan concedes a free kick for a foul on Matt Rhead.46:21
The ball is delivered by Dave Hankin, save by Shane Redmond.45:01
The referee starts the second half.45:00 +2:30 Half time
Half Time The half-time whistle blows.45:00 +1:32
Jonathan Worthington concedes a free kick for a foul on Anthony Malbon. Tony Breeden restarts play with the free kick.45:00 +1:25
The ball is sent over by Danny Andrew, clearance made by Luke Jones.45:00 +1:13
The ball is sent over by Louis Briscoe, clearance made by Tom Marshall.45:00 +1:07
Lee Stevenson delivers the ball.43:58
Unfair challenge on Kyle Storer by Jonathan Worthington results in a free kick. Free kick crossed by Kyle Storer, save by Shane Redmond.43:10
Matt Rhead takes a shot. Save made by Tony Breeden.42:38
Unfair challenge on Martin Riley by Ryan Rowe results in a free kick. Shane Redmond restarts play with the free kick.41:59
Effort from outside the penalty box by James Vincent goes wide left of the goal.41:02
The ball is swung over by Mike Williams, save made by Shane Redmond.40:12
Mike Williams fouled by Louis Briscoe, the ref awards a free kick. Direct free kick taken by Tom Marshall.39:37
Dave Hankin takes the inswinging corner, clearance by Lee Stevenson.39:37 Booking
Booking Kyle Storer shown a yellow card.38:19
Louis Briscoe has an effort at goal from the edge of the box that misses to the right of the target.35:07
Shot from just outside the box by Matt Rhead misses to the right of the goal.34:47
Andy Todd takes a shot. Save by Tony Breeden.33:29
A cross is delivered by Danny Andrew, Lee Vaughan manages to make a clearance.32:58
Dave Hankin produces a cross, clearance made by Danny Andrew.31:57
Outswinging corner taken by Luke O'Neill, Kyle Storer manages to make a clearance.31:45
The ball is swung over by Danny Andrew, Tom Marshall gets a block in.30:22
A cross is delivered by Marvin Johnson.29:54
Louis Briscoe produces a cross, Matt Rhead takes a shot. Save made by Tony Breeden.28:47
A cross is delivered by Marvin Johnson, clearance made by John Thompson.28:15
Free kick taken by Lee Vaughan.28:15 Booking
Booking Booking for Gary Roberts for unsporting behaviour.28:06
Unfair challenge on Lee Vaughan by Andy Todd results in a free kick.26:26
Corner taken right-footed by Luke O'Neill, Foul by Martin Riley on Dave Hankin, free kick awarded. Tony Breeden restarts play with the free kick.24:21
Kyle Storer takes a shot. Jonathan Worthington gets a block in.23:15
Corner taken by Dave Hankin, Tom Marshall has a headed effort at goal from close in which goes wide left of the target.23:10
Marvin Johnson crosses the ball, Jonathan Worthington gets a block in.22:30
Anthony Malbon has an effort at goal from outside the penalty area missing to the wide left of the goal.21:10
Luke O'Neill sends in a cross, save made by Tony Breeden.20:15
Direct free kick taken by Tony Breeden.20:15 Booking
Booking Danny Andrew shown a yellow card.20:09
Danny Andrew concedes a free kick for a foul on Dave Hankin.19:48
The ball is delivered by Danny Andrew, clearance made by Tom Marshall.16:55
Andy Todd takes a shot. Save by Tony Breeden.15:38
The assistant referee signals for offside against Ryan Rowe. Shane Redmond restarts play with the free kick.14:59
The ball is delivered by Lee Vaughan, Anthony Malbon takes a shot. Save made by Shane Redmond.14:41
The ball is swung over by Luke O'Neill, clearance made by Tom Marshall.13:50
Foul by Matt Rhead on Luke Jones, free kick awarded. Free kick taken by Luke Jones.13:24
The ball is delivered by Dave Hankin, Luke O'Neill manages to make a clearance.12:51
A cross is delivered by Marvin Johnson, blocked by Luke O'Neill.12:22
The official flags Matt Rhead offside. Indirect free kick taken by Tom Marshall.11:56
Gary Roberts crosses the ball, Tony Breeden makes a save.10:39
Shot from long range by Matt Rhead misses to the right of the goal.10:09
Mike Williams crosses the ball, save by Shane Redmond.9:36
Free kick awarded for a foul by Luke O'Neill on Marvin Johnson. Kyle Storer takes the direct free kick.9:19
Lee Stevenson takes a shot. Comfortable save by Tony Breeden.8:26
Foul by John Thompson on Anthony Malbon, free kick awarded. Free kick crossed right-footed by Kyle Storer from left channel, Luke O'Neill makes a clearance.7:42
The ball is delivered by Danny Andrew.5:35
Free kick awarded for a foul by Tom Marshall on Andy Todd. Shot comes in from Danny Andrew from the free kick, blocked by Kyle Storer.5:28
Luke O'Neill produces a cross, Tom Marshall manages to make a clearance.2:56
Matt Rhead takes a shot. Tony Breeden makes a brilliant save.0:58
Centre by Marvin Johnson, Luke Jones produces a header from close range which goes wide of the left-hand post.0:40
Short corner taken by Dave Hankin from the left by-line.0:11
Free kick awarded for a foul by Martin Riley on Ryan Rowe. Free kick crossed left-footed by James Vincent from right channel, save by Shane Redmond.0:00
The match has kicked off.
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