So I was jogging last time and thought about this:
A hero which generally makes damage based on the HP he misses. He will constantly lose HP/sec up to 50% of his life. Many skills will depend on how or high his life is.
Q) I have no idea for this skill yet, maybe a stun, another slow, channeled lifedrain...
W) The passive main skill which lets the hero lose x% of his life per second and a) gains per 10% life lost +1% movement speed (up to 5%) or b) gains +0.25 life gain per strength up to 1.25
E) Another passive skill which adds movement- and attackspeed based on how much life you have. (The more life, the higher the bonus)
R) The ultimate is a heavy aoe nuke and slow. I make a little calculation here to show what I am talking about.
1) Level 1) The hero has 1000 life of which are 50% drained, which makes 50% missing = 500 life.
He jumps between 4 people with 1000 life and the ultimate drains, when enabled, 20% of the missing HP from your surrounding enemies and give it to yourself.
After the ultimate, Hero will have full life (1000) and his enemies each will miss 100 HP each.
2) Level 6) The hero has 4000 life due to behemoth and else and has 50% drained, which makes 50% missing = 2000 life.
He jumps between 4 people with 2000 life and the ultimate drains, when enabled, 25% of the missing HP from your surrounding enemies and give it to yourself.
After the ultimate, hero will have full life and his enemies each will miss 500 HP each.
Second, the ultimate will deal a 15% movement slow in a 500 radius area.
Now, since Hero has full life, his bonus on movementspeed and attackspeed are on the maximum, which makes him a 4000 life unstoppable killing machine. Yet, he hast to time his attacks right and since a PK might be very usefull, he does not hit 4000 HP without crazy farm.
Well I think there is one very obvious build -> GET HP. No matter what, you will depend on that. Combined with his movementslow, fire&ice might be a choice. I think there is not too much to discribe.
Another interesting build could be to not skill W) which leaves him with the option to play him two ways. Having permantly the +attack and + movementspeed bonus of skill E would also offer an option. I dont know how this would fit with the hero, but might be worth a try.
I am not very good at balancing and I dont know how to structure the levels of the skills. I also thought more about the ultimate and I think it is very unique and offers a new gameplay. I invite everyone to change add or remove abilities or skills. I just wanted to share the idea and it maybe, one way or the other, makes it into the game!