It one shots most of the enemies you're going to be facing, after building some combo multiplier you can essentially heavy shot anything (I think it can also one shot stalker). the corrosive is to strip enemies of their armor but get rid of the thought of triggering status effect immediately because the status chance on this thing sucks ass unless you're some RNGesus. So this mainly focusses on dealing damage to low to mid tier grineer enemies and tougher infested enemies. Crits...You'll have to see what that does on your own, I haven't tested this yet but if I'm right this thing could go to red and orange crits. Crits probably [Shred] when this thing's used on [Harrow]. As for the riven, it's a [Stropha] critaata, the riven is only usable by mr 12 and above so feel free to replace it with [Shocking Touch] for lower levels.