Radiation rarely hurts. In fact, I think only the symptoms do- and they never arise immediately.
For instance, when the A-bomb was developed, the lead shield was knocked off and the isotope set free.
The closest person to the isotope died in 2-3 days, and while that was probably painful, it would not feasibly arise until after-mission, meaning radiation sickness is a bad idea, methinks.
I don't think you could have EMPs in space. From what I know, it's from detonating a nuclear warhead in the atmosphere.
However, a similar concept that I'm stealing from Gundam 00 is hi-energy weapons that can cause damage. Something like radiation along the same scale, where high particle exposure could lead to pain and horrible effects. I assume only high-ranking Tsuans would have crippling particle weaponry, where the other boss/sub-bosses would have ones that only cause pain. Which, if hit, could do anything from cripple accuracy to skipping a turn.
Another concept is Shields. Massive hunks of metal with sub-grade reflective coatings that, while it cannot take all damage, do well to block attacks.
Using one is simple. Instead of moving, Raise your shield. While you can fire and defend, you have to lower your shield before moving again.
The shield formula is simple, although not at first glance:
(Damage Roll Result)-((Shield Defense Number)/(Number of enemy attacks +1))
This means if one enemy attack was to deal 60 damage, and your shield had a defense number of 40, (60-(40/2)), (60-20), (40)
The new damage amount is 40.
Shields do less effectively against a multi-attack onslaught.
For instance:
If two attacks from the same enemy deal a total of 120 damage, with the same shield, 60-13 instead of 60-20.
Another device that I thought of would be a "capture" device.
If the higher ups are interested in Tsuan tech, the devs get to work.
When the devs get to work, they make some fun toys.
Such as the Net Bazooka, which is a large, one-shot launcher with four barrels with one missile in it each. Between the missiles is a wire net charged heavily with energy. It only works on a Tsuan with no shields left. Boss units get +50 to the break roll.
The only one that would be available would more'n likely be the crappy prototype- set at 10, enemy rolls a d100 against that 10.
Meh. That's just some ideas. I'll probably have more later...
Oh, like this dual shoulder weapon idea. It fits on both, so it takes up a weapon and utility slot.
It's a battery/tackle system.
It boosts the generator capacity at the start of the mission allowing for longer mission time, and offers a new attack.
The attack utilizes the booster, taking up energy and allowing the suit to dash forward at an enemy one space away despite having already moved (Costs more energy). Requires a lock on, though, so no free moves.
Dear god someone stop me.