Losing the Team Spirit

Sometimes, the loss of an item or, more usually, the death of a character, pushes an entire group of heroes or villains into a Heroic BSOD or over the Despair Event Horizon.

When this party-wide Heroic BSOD is triggered by a character dying, this is when the heroes or occasionally, the villains, lose the person who was really keeping their team going, either through leadership and direction, motivational speeches, or simply being funny and light-hearted and bringing some light into their grim reality. Maybe The Hero Dies. Maybe The Heart or The Chick fell. Suddenly losing the group's Mentor, or The Squad's A Father to His Men commander, will do it, and the loss of a family member will send a Badass Family soaring over the Despair Event Horizon. Basically, in this trope, a side just lost their morale officer, and now they are all in or near a Heroic BSOD, maybe even bordering on the Despair Event Horizon.

If it was an item, maybe the item was really important to the team, or maybe it was really important for something, and the heroes are painfully aware of what the loss of the item means. Failing to prevent the plot macguffin from falling into the villains hands doesn't do wonders for a heroic team's morale.

An apparent death can do the trick as long as the appearance is really good, and they have a period of time when they are utterly convinced. (When the appearance is engineered, expect the characters to be enraged when the deceit is revealed.)

Note that an individual's grief doesn't class as this trope. The loss of this person, or this item, has to have had a devastating effect on the morale of the majority of the regular party, one serious enough to temporarily stopping the team from working towards their goals. It can happen to villains as well, but this tends to hit the heroes hardest. Can lead to a Darkest Hour event.

An El Cid Ploy occurs when people try to lie to avert this trope.

If the death stemmed from a Heroic Sacrifice, someone may make a Rousing Speech reminding them all that if they fail, the death will become a Senseless Sacrifice. Indeed, the reminder that "Jack would not have wanted this" may stem from any death. Due to The Dead may come into play as they seek to challenge their grief. It can seriously complicate You Are in Command Now, though the new commander may remind them that their dead commander would be So Proud of You if they soldier on. Field Promotion is easier, but still reminds characters of the dead subordinate.

Compare We Were Your Team, contrast Decapitated Army.

Note, this is at least partially a death trope, so unmarked spoilers ahead.

Anime and Manga

 * Keichii of Higurashi no Naku Koro Ni's demise  A Shut Up, Kirk moment which had an immediate and demoralising effect on the entire group, turning a genuine fight-back into a hopeless rout.
 * Gurren Lagann.

Comics

 * The group of fugitives in Negation went through many deaths, but  death was arguably the one that really made them begin to despair, partly because of the way he died, partly because he was just a nice guy that everybody liked. Indeed, inscribed on his grave marker were the words, "he deserved better."
 * While the events of Civil War tore a rift between the heroes of the Marvel Universe, seems like the  death of Captain America brought on hell for the heroes, particularly the Avengers, and especially Iron Man. The Skrulls launching their siege of Earth didn't help resolve matters, and Norman Osborn becoming America's newest hero was just adding insult to (mental) injury.

Fan Works

 * Hades attempts to invoke this during the DC Nation Olympics arc - twice. All it succeeds in doing is pissing off the Titans (and Arrows, and Lanterns) to the point where Athena herself has to call a halt to things.

Literature

 * This happens at the beginning of The Will of the Empress, as the mages' travels have made them grow apart to the point where they didn't want to share the horrors that they had seen (or even participated in). By the end of the book, however, the four reunite and their sense of True Companions is even stronger than before.
 * demise at the end of Harry Potter and The Half Blood Prince has this effect on the entire school.
 * The loss of the Silmarils, as well as the darkening of Valinor, has this effect on the Valar in The Silmarillion. However, it doesn't have this effect on a large group of Elves, who simply decide to go on a Roaring Rampage of Revenge instead.
 * In JRR Tolkien's Lord of the Rings, this happens to the fellowship when Aragorn manages to pull them together long enough to get them to safety.
 * In James Swallow's Warhammer 40000novel Deus Encarmine, the already outnumbered Blood Angels are attacked by sorcery. Most of them fall victim to the Black Rage, which turns them into berserkers who fall on each other and die to the last man while their enemies jeer. The handful of survivors are dispirited. Arkio has to suggest suicide to Turkio to get him to rouse at all, even to the notion of a Last Stand, and when he proposes an actual attack, the others do not support him. He accused them of being afraid -- and they (Space Marines!) admit that yes, they are afraid.
 * In Sandy Mitchell's Ciaphas Cain novel Duty Calls, Cain is bewildered that anyone would go to extensive efforts to assasinate him when there were so much less expendable targets. Amberly Vail comments in a footnote that he obviously didn't consider the effect on morale of his death, which would have been horrific.
 * This is illustrated later in the same book when Cain is injured and an extract from Sulla's memoirs in inserted to fill in the gap. Along with the details of the battle it relates her horror on hearing that he had fallen and relief when it was reported that he just had a concussion.
 * Arguably occurs in Heinlein's "Starship Troopers" when the
 * In Suzanne Collins's Catching Fire, Katniss is so important to the rebellion that.

Live Action TV

 * In Charmed, Prue's death had this effect on her sisters. Piper reacted with a full-blown Rage Against the Heavens ("You can tell them that we buried their precious Charmed Ones when we buried our sister"), but even Phoebe was unsure how to go on without Prue.
 * The deaths of both Hillbilly and Ack-Ack on Peleliu cause a Heroic BSOD for Sledge's entire company in The Pacific. Although we have little time to see its full effects, the distress of his men is evident when Basilone is killed on Iwo Jima. Although he isn't dead, in The Pacific's spiritual predecessor Band of Brothers Winters's promotion out of the company and an incompetent replacement after his had-picked successor is accidentally shot and wounded by his own sentry severely impacts the morale of Easy Company during the Battle of the Bulge, particularly after Buck Compton's departure.

Video Games

 * While Cloud's reaction to Aeris' death was the most noticeable, in Final Fantasy VII the entire team suffers from grief after the event, though they display an astonishing amount of faith in Cloud despite Sephiroth's apparent ability to inflict Mind Control on him when present.
 * In Rome Total War, some units carried a standard which if lost had a morale impact across the entire army. Also, across the entire series, if you lose a general in battle, your army will suffer a morale penalty. Lose the entire ruling family and your faction breaks up, We Cannot Go On Without You style.
 * The tabletop version of Warhammer, where the battle standard often has various effects on morale. The mechanics have changed over the years, but in some incarnations killing a standard bearer could rout an army.
 * In Warhammer 40 K, killing the Tau armies Ethreal has this effect. Either it breaks their morale, sending them fleeing, or causes them to go on a Roaring Rampage of Revenge, gunning down any enemies on their patch.
 * Killing the highest ranking guard in a group you are fighting in Assassin's Creed and its sequel will send the rest fleeing potentially. Also, from a storyline perspective,
 * In Halo, killing the elites or brutes that are leading a group of grunts will temporarily throw them into panicked disarray. It can happen from time to time with low-ranking jackals as well in the first game, but they're usually disciplined enough to stand and fight.
 * In Dynasty Warriors and Samurai Warriors, morale plays an effect on how well your AI-controlled troops do, so you can gain it by fulfilling mission objectives or killing enemy generals and lose it via failure / death on your side.
 * Persona 2: Innocent Sin: everything goes to hell after, leading right into Eternal Punishment.
 * In Persona 3's story, has this effect on SEES. Happens again in grand fashion in The Answer; when
 * When Commander Shepard is killed at the beginning of Mass Effect 2, the team is unable to hold together, and breaks apart. Shepard was the linchpin holding the group together.
 * Unfortunately that fact that s/he's working for Cerberus means that some former squad members feel that the team spirit is completely gone.
 * Widespread in Mass Effect 3, between the horrific casualties caused by the Reaper invasion and the seemingly invincible nature of the attackers. One of the most common sidequests is recovering an artifact or emblem of [group X] to restore their will to fight.
 * This happens at the end of Wild Arms 2, after the team is forced to kill . They saved their entire universe from annihilation, but can't bring themselves to call it a "win", and walk out in a slump.
 * Occurs towards the end of Blaze Union following . The fact that this comes hand-in-hand with The Reveal concerning Gulcasa's true identity doesn't help. While Gulcasa eventually starts to pick himself back up (with a little help from Nessiah) and most of the team rallies around him as the new Heart, it's too late for, which causes the party to schism even further as they and a few other members leave for good.

Web Comics

 * In Order of the Stick, ultimately has this effect on the party. Their physical separation is problematic enough, but it's the loss of their guiding sense of purpose and the mediator responsible for keeping their individual neuroses in check that causes the group to fray so badly and fail to accomplish anything significant for months on end.
 * In Ninth Elsewhere, Carmen and Eiji experience this because of the

Western Animation

 * Justice League Unlimited -in an alternate universe, the death of the Flash results in the League becoming obsessive, world controlling Knights Templars. It's implied that the same thing would happen in the regular universe, if Luthor were allowed to come to power as president.
 * Avatar: The Last Airbender -this briefly happens to the Gaang when they become

Real Life

 * This is an efficient method of demoralizing enemy armies. Taking off the head, or offing the enemy's main motivator can do wonders to crush morale, and by extension, the enemy's will to fight.
 * There are many subversions in real life as well where the death of an important figure only martyrs them in the eyes of their group.
 * Ancient Romans had standard bearers that would carry a golden eagle as well as the unit's standard. As long as this eagle was in the hands of a Roman soldier, they would continue to fight and protect the standard bearer. If it was lost, the entire battle was considered a lost cause as well.
 * There was a story like this in a Latin III book of mine, in which the soldiers were reluctant to get off the boat due to not being able to get close enough to shore thanks to enemy attacks and projectiles. The standard bearer jumped off the boat and started running into battle. He was quickly joined.
 * That would be the invasion of Britain. That Channel ain't half cold in the winter.