Odin, aspect of the hunt.
Every time time Odin kills a god with lunge and/or raven shield damage, both skills cooldowns are reset; To counter that, the base cooldown of both skills goes up by 5s.
Very simple change that would promote some super hit or miss Odin plays that could be huge in a skilled players hands, of course the downside could be different as it may hinder too much of Odin's early game.
Could also make it easier to proc, like the good old spear of desolation which also works on assists, depends on how much balance the cooldown reset needs really.