It's rarely used or learned because it's very niche compared to the other movement options. If it was a must-know, then it wouldn't be somewhat obscure. An item that improves slide turning speed would be fun, but jump height would actually harm movement more than it would help. Air control is very limited in this game, so it would actually make jumping riskier to use in combat. Also, it would interfere with trying to bhop/slidehop around doorways and corridors.
There's also a lot of nitpicks about the stat numbers, but the item concept matters more than the small things. What if it made downdashing free on a CD like Kinetic Dash?
If you're concerned about that, it's already got a lot of similarity to lifestrike and slowing hex. I'm not sure what could be used instead of another slow, but I do really want to see a ground pound item.
All pretty valid points.
I could be convinced that it would make ground dashing free like Kinetic dash does for dash jump. I think the item, in order to be an effective Ground Pound effect, has 2 questions to answer:
1.) What effect works well for someone who just performed a Ground Pound to follow up with?
2.) What support does a Ground Pound need to be an effective combat maneuver?
For the First one, I would think that someone doing a Ground Pound would want 3 things: a.) faster CD on their Melee items (Resetting the CD on Lifestrike/Spirit Strike would be really handy) and b.) getting/keeping enemies close, finally c.) Faster melee attacks
So applying a slow to affected targets is generally pretty good along with improved Spirit Resist reduction is good, but I could see the Body slam effect just applying damage and doing either:
a.) Pulls enemies towards you
b.) Increasing movement and Melee speed
As for the support needed to make Ground Pound style attacks effective, I think they are at their best when used sparingly or else you need so much support for it that you end up needing an entire Hero kit to support it, like Lash's.
To that end, I think we could actually increase the effectiveness of the Body Slam passive, but increase it's CD as well without negatively impacting it all that much.
So let's try another version: (I like to iterate a lot. I find you end up with the best results that way)
Item: Body Slam
Cost: 3000 souls
Component: Spirit Strike
Type: Spirit
Passive Stats:
+
90 Spirit Shield Health
+
15% Melee damage
+1 Stamina
Passive Effect 1: Spirit Strike's normal Passive
Passive Effect 2: Body Slam
Cooldown: 35 Seconds
Dashing to the ground no longer costs Stamina to you, and you cause an explosion around you on landing, immediately dealing light melee damage along with additional Spirit Damage. Enemies hit are pulled closer to you, and you gain increased Movement speed, melee attack speed, and Stamina regeneration for 12 seconds.
-Bonus Spirit damage: 200 (+1 damage per Spirit)
-Movement speed and Melee attack speed Increase: 15%
-Pull distance: 5m
-Increased Stamina Regeneration: 30%
-14m radius
Honestly, since the item is only supposed to be 3k it's probably too much, but they are ideas and sorting through what should and shouldn't be kept is something that can be hammered out.