The Chosen Ones

Did you go in playdota.com/heroes ? You can see some great idea...

For exemple :
Sourge agility, the first hero, 4th skill "Rupture". That deal damage when you move.
or
Sentinel strength , fourth hero, 1st skill "Fissure". That create a impassable crevasse who stun and deal damage.
or
Scourge intelligence, 7th hero, second skill "Heartstopper aura". Passive, Deal damage to very body every second based on max HP.
or
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They are 400 skills...

If you have an idea of kind of skill you need, like area or target, DoT or burst, passive..., tell me I can find some...