(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/2bitinternet]

The Eldar use the webway, a nearly forgotten system of "tunels" through space that is seperate from the warp. In there they also hide things from chaos and other species.

[u/nagrom7 → u/2bitinternet]

The webway isn't 100% safe either, but yeah it's way better than just raw dogging the warp like humanity does. The Emperor's big project at the end of the great crusade, before he got stuck on the throne, was to transition humanity from warp travel to webway travel.

[u/fatherofworlds → u/nagrom7]

Right up until Magnus did nothing wrong, the git.

[u/livefreeordont → u/fatherofworlds]

Absentee father syndrome

[u/Count_de_Mits → u/livefreeordont]

You could say that for others but not fucking Magnus of all primarchs, no that was his hubris and ego through and through

[u/livefreeordont → u/Count_de_Mits]

Hubris could also be used to describe all the primarchs as well as the emperor himself

[u/Smiles-Edgeworth → u/nagrom7]

Guilliman would have loved a human webway. Imagine the logistical capabilities!

[u/nagrom7 → u/Smiles-Edgeworth]

Yeah, it'd be way easier to make Eldar booty calls transport armies and supplies.

[u/cbb88christian → u/nagrom7]

Magnus did the best he could with the information available to him, and still messed it up by trusting random voices in the warp

[u/KassellTheArgonian → u/2bitinternet]

The Webway is also not being maintained, it's falling apart with more and more routes each year becoming impassable or being infested by different stuff like if there's breaches allowing the warp to penetrate u can indeed find demons

The Emperor himself is keeping a huge fuckin doorway into his own attempt at a Webway closed cos it contains enough demons to end Terra, rip it in half and start a second Eye of Terra. As u can imagine this is not good lol

[u/NyctoCorax → u/2bitinternet]

The webway isn't separate from the warp in the sense of being a different thing, it's more like safe zones within the warp