Queen mab.spell problem

Hello. I was reading few topics but couldnt find there anything about my problem.
Queen mab supposed to burn mana and do dmg. Many times I checked and enemy got like 10+ mana i used queen and nothing happens. Mana still there and no dmg done.

Was there any change which is not displayed in spell discription ?

Just FYI, mana burn doesn’t drain the mana. You should see the damage though if they’re not immune to mana burn.

Oh ok. Will double check than this dmg and if there is still same problem i will make a screenshot and post it here.