Hello people! With some combination of Iridar's template master, Musashi's mod fixes and a few other mods, this weapons' rend ability disappears. There is a fix, here: https://pastebin.com/eG9NJySv
Create a config file called XComTemplateEditor.ini inside this mods' config folder and add what's inside the link to fix the issue, if you have it.

it done.I comment out the WeaponCategorySets

@XpanD +WeaponCategorySets=(WeaponCategorySetName=StormriderWeapons, WeaponCategories=(sword, combatknife, shield, gauntlet, psijack))

Just to confirm... You've tried "sword, combatknife, shield, gauntlet, psijack", yes? That should work, but good to double-check.

but at first,the gauntlet i add and work fine in Iridar's Stormrider Class‘s XComAbilityToSlotReassignment.ini

Can't help you then, sorry. This wasn't made with LWotC in mind, and neither was base Amalgamation Classes I believe.

i use mod jam and lwotc

not work,the promotion screen just show the restrictions are sword, combatknife, shield and gauntlet

Ah, my bad. You asked for template names, so I gave those, forgetting there are category names as well. Use just psijack, that should do it

still not work

+WeaponCategorySets=(WeaponCategorySetName=StormriderWeapons, WeaponCategories=(sword, combatknife, shield, gauntlet, PsijackOHT_CV, PsijackOHT_MG, PsijackOHT_BM))

PsijackOHT_CV, PsijackOHT_MG, and PsijackOHT_BM

What is the psijack templatename? The stromrider's abilities still connect with the StormriderWeapons

Updated blocking a few more specialization combos based on suggestion I got. Apologies if that "breaks" anyone's existing soldiers, you should be able to get around that by commenting the relevant lines in Amalgamation.ini, and if that doesn't work then Amalgamation Console Helper together with Additional Soldier Console Commands will allow you to re-roll the soldier's class.

"I've left commented out lines in XComWeaponSkinReplacer.ini that can be used to change it to vanilla Rend (thus removing need for Proficiency Pack, just comment out relevant RequiredMods line in XComGame.ini too), or even Sword Slash if you feel like having momentum is too good (note: I assume it'll work, but I haven't actually tried this out)."

Thank you for this. This saves so much time and faffing for those who don't use the Prof Templar's <3