lightning warp doesnt work with echo

Lightning Warp does not work with Spell Echo, this is intentional.

Lightning Warp cannot ever be cast while it's in progress. Casting the spell sets up a delayed effect that will teleport the caster at a later date - casting again during this time does nothing, so echo would leave the character uselessly performing a nonfunctional cast. Lightning warp doesn't work with echo for much the same reason as auras - it's not a spell that functionally makes sense to repeat in general.

In the specific case where the character reduces the duration enough (or lowers their cast speed enough) for the duration of the warp to expire, it could theoretically be repeated, but a) supports either work or don't, they can't only work for this case, and b) you'll be in the location that the first warp targeted, which is invalid to target with lightning warp, and repeated spells always keep the same target - so even in that case the repeat would target your own location, and get teleported instead to a random location because that's invalid, meaning you'd loose all control of where you teleported to.

"

Darion88 wrote:

Then why multistrike works with leapslam?

Because leap slam is fundamentally very different to lightning warp and can be repeated as soon as the action is done, which lightning warp can't - all the things I explained in my first post about lightning warp don't apply to leap slam because it's an entirely different skill that doesn't work at all the same.
There's basically no comparison between how the two skills work beyond both of them eventually resulting in you being in a different place.