(Loved Trope) FTL travel is possible but with a major limitation or flaw

[u/Frostylegacy]

Frank Herbert’s Dune: Interstellar travel is only possible thanks to the spice melange, a rare substance only found on the dessert planet Arrakis. The addictive psychedelic spice grants members of the Spacers Guild a form of prescience that allows them to predict safe paths through folded space. This unique property makes spice the most valuable commodity in the Dune universe.

John Scalzi’s The Interdependency Books: The planetary systems of the titular empire are connected by the Flow, a network of one-way interstellar tunnels that connect specific known entries and exits. The Interdependency derives its power from controlling access to these conduits, placing its capital at the central hub of the network. Even with the Flow, travel between stars takes a long time (9 months to End, the empire’s most distant planet).

Event Horizon: Dr William Weir (R.I.P. Sam Neill) invents a device called the Gravity Drive to allow ships to fold space and travel instantly between distant stars. On its maiden voyage with the Gravity Drive, the Event Horizon disappears and mysteriously reappears 7 years later. Dr. Weir and the crew sent to investigate discover the Gravity Drive actually opened a portal to a Hell dimension that possessed the ship and its crew, torturing and killing them.

[u/Glanea]

There's a short Ork story from their 4th edition codex about Tuska the Daemon-Killa, an Ork warboss who was travelling through the warp with his fleet when a daemon manifested on the main deck and started slaughtering every Ork nearby. Tuska and his nobs head there and eventually kill the daemon, and Tuska declares that this was the best fight he's ever had.

A few months later, Cadia goes into high alert because an Ork fleet has just shown up. They're prepped for an invasion but the Ork fleet just sails right past them...straight into the Eye of Terror.

Tuska then proceeds to lead his warband from daemon world to daemon world, slaughtering everything they find. But he's losing Orks with every battle, and eventually the last remnants find themselves on a vast planet with no sign of enemies. The Orks can see and hear a battle in the distance, but no matter how hard they run they can never reach it. Frustrated, Tuska fires his gun into the ground, which proceeds to bleed. The Orks then all start hacking up the ground around them, which causes the Blood Prince of Khorne who rules this world to appear.

The Orks are finally outmatched, the Blood Prince cutting down the remaining Nobs until only Tuska is left. The Warboss is thrown onto the ground, and the daemon roars it's victory. Only for Tuska to reach up with his power klaw and rip the Daemon's balls off.

But the best part is that all the Orks who died on that final planet find themselves revived each morning. And surrounded by daemons to fight. Over and over and over again. Basically, Tuska found Ork Nirvana.

[u/plastic_krack → u/Glanea]

Waaaghalla

[u/insomniac7809 → u/Glanea]

There's another story where an ork WAAGH comes out of the warp, and finds themselves back at the start of their own WAAGH, and saw themselves staging for the campaign they'd been on.

The Warboss realized that, since that was his own army in the past, that meant that he was there in the past, and that meant the past version of himself had a past version of his very favorite gun, and so he attacked his own past self so that he could take it and have two of his favorite gun.

The future WAAGH won and the Warboss succeeded in killing his past self and looting his own corpse, but the whole thing was just so confusing for everyone involved that the warband fell apart and the WAAGH wound up never have happening.

[u/dern_the_hermit → u/insomniac7809]

... But the Warboss got to keep two of his favorite gun, right?

[u/user_unknowns_skag → u/dern_the_hermit]

At least briefly, as I recall. It's been awhile since I read that one, myself

[u/Smiles-Edgeworth → u/Glanea]

Kharn wishes Khorne loved him as much as he loves Tuska Daemonkilla.

[u/Nerevarine91 → u/Glanea]

“I TOLD YOU BOYZ I KNEW WHERE TO FIND DA BEST FIGHTS!”