Skill Info:
Damage done in an AoE 15+12 every level 1-7
Damage done in an AoE +20 every level 8+
Background:
One thing that manaless heroes have been lacking since the dawn of time is a solid farming skill. This skill wont keep you up with chain light, but as far as passives go, it is a great farming skill. The downside is that late game, when farming skills become useless, this one is pretty bad also. Still better than most farming skills end game though.
General Info:
the only thing you can compare this to is a fire orb. If you crunch numbers, you will find that as you level this, the average damage is pretty bad. Damage dealt by this is PURE damage though, and the AoE is large. This is great for farming until level 30 or so, and good for pvp in larger games where the splash hits multiple people.
Skill Usage:
You want to level this skill as fast as possible. If you are farming with this skill, it can be assumed you have low mana. Endurance aura goes hand in hand with this skill. More attacks=more procs=more damage=better farming. I wouldnt not suggest this skill on slower attacking heroes or ranged heroes. this skill is really based a lot on attack speed, and early on, ranged heroes have really bad attack speed, compared to a melee. If you get this skill, you may also want a skill that can be used both mid and late game. A skill like Roar would work, if you had enough mana for it. Stun field would work, or really any skill that is usable early for farming a little, and usable late game for pvp as well.