How can I make Bloodlust a hero ability that...

How can I make Bloodlust a hero ability that...

How can I make Bloodlust a hero ability that automatically works on the caster like Avatar, but does not have the little timer bar. I want it to act just like bloodlust, but only effect the caster.

Use the skill "frenzy". Its an auto cast bloodlust the targets the caster as soon as its used.

Well it casts automatically, but then you have the options to autocast and deactivate just like the regular frenzy. I need it to be a regular ability, is this possible?

Base it off berserk, just lessen the damage taken increase to 0.

What about the Goblin Alchemist spell from the new patch?