Concussive Bomb says it converts a percentage of physical damage (100% with 3 ranks) to lightning damage. Since it’s attached to the Canister Bomb skill line that usually means the damage conversion is very specific to just that skill line but neither Canister Bomb nor the modifier Improved Casing list physical damage among the damage types. Pierce damage is listed on both Canister Bomb and Improved Casing but that’s a different damage type altogether, isn’t it? If it was converting Pierce damage it would say so specifically, right?
It converts Internal Trauma to Electrocute like any other conversion with corresponding dot attached to the main damage type - Pierce , Aether and Chaos being exception due to no DoT potential . Bleeding is completely independent cant be converted or converted to
Oh! I actually did not realize that the associated DOTs were converted alongside the strike damage but that makes a lot of sense.
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Quick follow up question just to clarify my understanding of damage conversion: does Arcanist’s Tainted Power convert all Lightning and Electrocute damage from AAR and Disintegration to Chaos strike damage since Chaos does not have a DOT? Or does the Electrocute damage just get left behind in that case?
This. Dots do not get converted when the target damage type has no dot.
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Thank you! How did you guys learn all this?
By asking on the forum mainly 
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lol glad I’m in good company!
Chaos , Aether and Pierce have no DoTs , so any conversion to this types of damage leave DoTs untouched . Bleeding is completely independent damage type you cant converted or convert to bleed any other damage type
I’m sorry, you did say that. My bad.
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