I have noticed that even though there is no "rolling thunder" perk on my thunderlord machine gun it still has a chance to explode npc and player enemies in a very satisfying and large electrical explosion...Awesome! My question is two fold, has anyone else noticed this on their thunderlord and is there any other exotic out there with an effect that is not mentioned in the descriptions or perks?
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I believe all exotics have a hidden perk. Thunderlord has chaining Arc Firefly, Gjallarhorn has Proximity Detonation, Truth has Tripod, Mida Multi-Tool actually has a couple of hidden perks like increased ADS speed, it makes noise when you're near a chest or other item of interest, it seems to snap to headshot when you ADS as well but I'm not 100% sure on that. I don't actually use too many of my exotics very often these are just the ones I've noticed (I don't have Thunderlord but I've seen the Arc Firefly effect first hand). I'm sure most if not all exotics have some kind cool perk like that.