Demolitionist’s Explosion Damage Bonus Effect
One of the new traits added in the Pre DLC Subject 2923 patch, Demolitionist gives a flat bonus to all explosive damage. There aren’t a lot of weapons that use explosive damage or can benefit as far as I am currently aware, so this is a bit limited in it’s benefit. Some of the items that do benefit are the Explosive Shot mod and the Pride of the Iskal pistol.
How to Find the Demolitionist Trait
To unlock the Demolitionist trait, you need to kill 100 enemies with explosive damage. The fastest way I have found of doing this, is using the Pride of the Iskal boss weapon pistol you can get from defeating the Iskal Queen, as it’s primary fire actually deals explosive damage, the only weapon I know of to do so. As mentioned above, you can also use Explosive Shot mod obtained from the earth boss Brabus.
While I am not certain if other weapons can qualify, I would recommend trying to unlock this with any weapon or mod effect that has an explosive effect to it, like Spore Shot, if the above two options are not available to you.