Currently it extends the duration of tripmine grenade by about 20 more seconds. This armor piece is clearly designed for PvP and the biggest problem with tripmines are that they can be shot and destroyed easily. It'd be cool if Young Ahamkara's Spine extended the duration and made tripmines undestroyable.
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This thread has been recreated numerous times. It doesn't need a buff, you need to learn to use them. Your tripmines are being shot? throw them somewhere that's out of sight! ie, past a doorway that they HAVE to walk through to even see the grenade.