According to Op:

Description:
Aims to give a pause, and sound/visual effects during the clash event of two Helpers.
Basically, check if a helper has collided with another helper(that has also a Clsn2) and then: Pause both, and give a Hitspark. You can also set your own sounds and ClashSparks inside the "ClashSpark" function

Installation:
Add helper_clash.zss to your common states.

Issues and Limitations(currently):
Only works with helpers that; Has both Clsn1 and Clsn2 respectively, and has an active Projectile Hitdef (NP,SP,HP).
It does not work with helpers that use ProjectileSTCRL as their Hit mask.(ex: Warusaki3 stuff)
Does not work with beams, specially if they don't have a Clsn2, and if they don't have an animated Clsn or have too fast movement.
-This module uses (modifyPlayer's hitpausetime). So some unexpected behavior might happen on helpers that have Ignorehitpause stuff, specially the ones that have a ignorehitpause on hitdefs.

Set your sounds and clashsparks:
Modify the function "clashspark" inside the file, add your explods/helpers that will makeup your effects, and sounds.

Notes:
-There is no customization right now besides the Clashspark function. Might do it in the future if enough people interested maybe?