Edit: Replaced by my new rule: everytime someone complains about Beastmaster, says it's bad, says it's not so bad after all, asks why people think it's bad, ask why it's bad, ask why it's so underrated, ask why it's so overrated etc, every Beastmaster Ranger in the party take 3d6 damage per level. And the person who asked takes twice that amount.

For example a level 9 beastmaster and a level 3 beastmaster that's 27d6 = 96 for one and 9d6 = 34 for the other and the person who asked takes (96 + 96 + 34 + 34).