Well, both stutterwarps and reactionless drives would be off that list. :)

The overarching trouble here is that any magical tech that violates currently known scientific laws will be "gameable". There will be exploits that let such a system do amazing, plot-wrecking things. If you patch the magic with more magic, you just change the set of exploits.

On Mon, Jul 20, 2015 at 4:11 PM, <rupert.boleyn@gmail.com> wrote:
On 20 Jul 2015 at 4:48, Kelly St. Clair wrote:

> The kinetic energy in a 100 ton mass traveling at even a "mere" 1% of
> c is... considerable.
>
> Long and short of it:  space is big, really really big (down the road
> to the chemist, etc etc).  Any form of travel energetic enough to get
> the PCs from point A to point B in a reasonable amount of time can
> probably be converted, somehow, into a big enough BOOM to absolutely
> ruin a lot of people's days.  So it's really really hard to keep WMDs
> out of the hands of adventurers, because they "need" one just to get
> around the setting.

'Inertialess' systems like stutterwarps and so on are one way. They at least keep the
required real velocity change for a ship down to the relative veocities of the stars and
planets the ships are to visit. If you're playing a game where concerns about breaking
physical as we understand them is a problem they are likely to be off the list, of course.

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Craig Berry (http://google.com/+CraigBerry)
"Eternity is in love with the productions of time." - William Blake