Their “nice” gas might be the gas form of soothing balm. Also it’s effect is to reduce the stamina of everything caught in the “soothing” cloud. Also if it lays eggs why not make its crap soothing balm?
I think ark should make narcotic spike walls, because narcotic tripwire traps render it untameable. Narcotic spike walls will deal damage to the creature attacking them, but not as much as a regular spike wall. Then you could stand in a ring of narcotic spike walls with a pachyrhino, use aggro mist, and tame some of the unconsious creatures! To craft a narcotic spike wall, i think you should need: One spike wall and 5 narcotic. The narcotic spike wall is similar to the tranq arrow, ingreadients and function. Please ^ if you want this idea to come to life! ;D
While fishing, are you sick of all the fish being scattered? If you bring this dino near the shore or on a boat where fish are near by and use the aggro mist, it will aggro the fish to come right to you in a big crowd!