Currently, EM can only be used to do missions and build up bases
These defences that I'm thinking of are disposable trap artifacts that are unlocked from blueprints gained from missions
My first and only current thought is the ESID (Exotic Ship Imobolising Device), planetary trap ,costs 1000 EM, last one week just like a regular traps. the effect of this is that this trap does damage equal to the attacking player total attack minus the planet's combined attack that would most likely make planet attacking a bit more dangerous
I don't have any other ideas for artis or missions (a new arti would be unlocked for every completed mission), so ideas from other people would be greatly appreciated

there are already other uses for EM...
for starters... blue prints for some artifacts
and furthermore, the infinite repeat purger task

It probably have a few other uses that I'm nothing thinking up but...

I won't mind more uses for it, but ur reasoning is horrible for it....

Bases require a huge amount of exotic matter, and there are plenty of other missions that require it as well.

However, Dan has previously said that he's thinking about adding new ways of both gaining - and using - exotic matter. So this might just make it in to the game.

Political favour too.

viewtopic.php?f=6&t=13217&p=115711&hilit=political+favor#p115711

Can't find a post mentioning EM though.