Everything goes well with Traps. There's synergies with it and every available blast set. Just pick one that looks neat and run with it.
Head of TRICK, the all Trick Arrow and Traps SG
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Ice. Ice blast adds some control so you will be liked even more on teams. Ignite from Assault Rifle is delicious with web grenade though.
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You might know me as FlintEastwood now on Freedom
If your looking forward to solo. Energy has fantastic knockback which gives some control. As for ice, the holds and sleeps are good for soloing. About everything goes with traps so I suggest you pick what wont drain too much end.
I'm looking to make a Traps Defender, with the end goal of ridiculous defence via FFG and set bonuses. It looks like just about any secondary will do for that, as most seem to be able to take a few Thunderstrike sets and an Obliteration.
So are there any secondaries that interact particularly well with Traps (which I've not played before) or are just generally good? I'm leaning away from Archery, Assault Rifle, Electric, Energy and Sonic because I've used them before, whereas Ice, Psi, Rad and Dark are new to me (I have a few lowbie Pistols characters).