Here's my updated version of Saving Slam. I've put some thought into it and I think replacing Death Slam with this is not too bad. With the added 30% cooldown reduction you also have to consider the possibilities with this new ultimate ability. While it does not have any more damage potential, it provides so much support.
It can help people get out of team fights and also get into team fights. A lash with saving slam could soar above the skies, use Saving slam on his team and throw them all the way across the map towards some objective they have to take at high speeds, or he could use it to throw a team above some roof and right into an unsuspecting group of enemies. You can consider this new ultimate as potentially using rescue beam on 5 people at once.
I feel like adding Saving slam on top of death slam would make death slam too versatile and I think the sleuth of support and attack strategies you could pull off with this new ability are nothing to scoff at.
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I repurposed your idea for the new grapple escape into a new item, I think just having grapple be able to hook onto surfaces is very strong and shouldn't be overlooked. I don't think it needs anything else added to it, additionally, the reason why this is a new item instead of replacing grapple escape, it because I think grapple escape still has some things that stone hook couldn't do.
Grapple escape would be good at chasing enemies and maybe escaping enemies too a bit (though I think stone hook does it better). Stone Hook would be more versatile and would be better for moving around the map quickly, both have their merits so that's why I think they should both be items (And both 1250 souls).
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I'm also introducing two new item ideas, Anchor Slam and Elbow Bash.
Elbow Bash is a pretty simple item, lunging Lash forward when using Ground strike on the ground. I think this item would be pretty neat since it adds a bit more option to how Ground Strike is used. Ground Strike is usually more optimal when used at height, but with this item it gives ground Ground Strike ( Ground^2 Strike ) a bit more usefulness. The forward lunging would take enemies by surprise and would give Lash a bigger range of attack with the added benefit or extra mobility when not used for damaging purposes.
Anchor Slam is more of a random idea. The main idea was to have death slam offer a way to pin a single enemy more, which Anchor Slam would provide.
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