It's very easy to avoid as the invisibility does not make you fully invisable, I have never died to khepris sting because it's easy to see coming.
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It is easy to see comming if you run into them like an idiot. It removes you from the radar for 9 seconds if you dont run or jump. Easy to ambush super behind walls when they dont know you are there. And you can apply the 6x dmg and DoT to GG/SHADOWSHOT and BLADEDANCER. Making blood bound very lethal. The invisible backstab does 607 dmg if the enemy is not in a super. And the normal melee while invisible does 120 dmg and about 50 in DoT in the timespan of 9 seconds.