For example: -Client has a perm +10% movement speed buff with base movement speed of 500 -> 550 is the final movement speed for this client. -Client has an ability which grants an additional 10% movement speed buff. It is expected to sum the % based multipliers for a final 20% bonus to 500 -> 600 movement speed. -However on the client, we just apply a 10% buff to 550 -> 605.