Doctor Octopus Bug/Nerf?

Why did Kabam take away his signature chemistry ability Aka Health steal? This is a champion who has been in game for about 3 years. You can't do that. It is unprofessional. If this is a bug, please register this as a headsup . If not, you will have to explain why this was made and you will need to fix it back also. Thank you.
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Comments
This is a sig 200 doc ock he should be healing a lot. He doesn't since 1/3 of his sig ability is completely missing