Herbal Antidote (and Nature's Blessing) cleanses the benefits of Battlemaster.

Steps to reproduce:
1. Deploy Elven Strategist.
2. Deploy a couple of runes around him so that they benefit from his Battlemaster.
3. Cast Herbal Antidote.
4. All champions within the Area of Effect will lose the buff gained by Battlemaster.
5. Moving a tile with a Strategist will reapply the buff but it's still annoying.

@Sokolov

 

It was and I remember mentioning this a couple of times in a guild chat, always forgot to make a thread though.

 

I know! I had this happen to me back in like 2009-2012 too, but I wasn't much of a poster back then so it slightly amuses me this still happens.

 

Bump, still the case.

Proof - before herbal antidote:

After Herbal Antidote:

 

Small update - this seems to apply to ALL forms of cleansing, including Purified and Cleansing Aura. The only way to restore battlemaster benefits is to move the Battlemaster champion or to re-enter the Battlemaster aura.