User blog comment:Emptylord/Custom Champion - Behemoth the Earthbreaker/@comment-3974211-20170501112809/@comment-3974211-20170501124610

The shield break on the Q has been there from the start, I just added the link. It's why the ability is called "Shatter". ;)

20% might be a bit high early game, although having an additional damage dealing ability early game is also pretty strong. Factoring 30 armor/MR, 20% pre-mit damage will trigger at approximately 15% missing health (and with runes and masteries, 50 armor/MR is closer 13% maximum health) - so it's only a small change compared to the previous value early game, but as you build more resistances it will trigger more frequently (perhaps even too frequently, actually). I'm not sure what you mean by the "counting down" question, though. It tracks the damage taken at all times except while the effect is already triggered - so those 3 seconds are the best time to burst him.

Regarding turret up-time versus him - I'm inclined either to increase the cooldown or give turrets an immunity for a period of time (perhaps 8 seconds?). I think the duration needs to be semi-long to make it appreciable - another shorter and it'll feel pointless. Perhaps sharing an immunity period with Ohmwrecker (which I forgot about), to prevent chaining? Would chaining be a problem? (Plenty of champions have item-synergy above other champions).