With the base kit until lvl 13 it adds up really fast if a target is attacked, for a total of 52% reduction with Sadism and Blood Bond. If you take Sadism extra reflect at level 4 and the BB talent at level 7, it also adds Resistant and extra reflect, adding up to a total of 68,5% (!) damage reduction of which 25% is reflect. There is no way a LiLi of Malfurion keeps up with that on the short term. If you take all the support talents you end up with about a 76% reduction, of which 30%...

Hey, thanks for your reply. Transfusion is basically Diablo's lvl 13 talent, which is considered really weak. Putting it at tier 1 for a new hero is a little experiment. Making is 1,5% would make it a stricly better Giant Killer. Maybe 1,25% could be pushed. Diabolic Ward can be changed if it looks too good compared to the rest of the tier. Blood Bond does not stack. It's like an enchantment you can spam on every member of the team (like Regrowth).