This is your standard viral build for using the primary fire on the [Panthera Prime]. This takes advantage of the extremely high slash value to stack up as many slash stacks as possible while augmenting them with viral stacks for that sweet sweet damage to health modifier.

This is also capable of using the secondary fire rather well but it is not the primary goal of this build.

If you have access to [Primed Shred], put it in the place of [Vile Acceleration] with the needed forma. Doing this will allow you to take advantage of punch through to hit multiple enemies in a line without losing much damage since the radial attack is minimal and will be mostly compensated with by the punch through.