I recently made a thread Gildor’s Pulverizer’s skill mod being weaker than any other 2h Grenado related skill mod
Pierce as a damage type is something that is found in melee only and besides Forcewave I don’t recall any Pierce Caster abilities. With recent support some minimal damage in grenado can be utilized to make a sub-optimal pierce caster
I feel Pierce could use more caster support. No idea why we didn’t get any skill mod to support Pierce Phantasmal Blades. But if you don’t want to support it, it’s fine there’s another shotgun skill with Pierce Caster potential - Stun Jacks
Stun Jacks can receive a skill mod that converts all the Physical damage on it to Pierce damage
This doesn’t need to be a separate mod and can very well be added to Gildor’s Pulverizer (no it won’t make the weapon broken, I tested it myself. Pierce Stun Jacks + Pierce Grenado even with this boost isn’t likely to compete against other SJ/Grenado builds)
In addition to Phantasmal Blades and Grenado which you mentioned…
Ring of Steel
Blade Spirit
Horn of Gandarr
Any skill with a weapon damage component and Physical damage + 100% Armor Piercing
Dual Bladetwister Signets + Mythical Pack of Treacherous Means + Lightning skills
Have you tried pierce PhB? You run out of energy in about 5 seconds, the itemization just isn’t there, better to go spirit based. PhB being a weak build in the first place also hurts the pierce PhB.
Pierce PB is in awkward sport, since with transmuter most of the pierce damage gets converted to vitality. But without it you could apply pierce only every few seconds. Crate tried to force pierce+bleeding meme, but it never took off.
Only Forcewave fits the bill
CT and Phantasmal Blades won’t work here
I already use this for Pierce Stun Jacks
The other possible way to use this is with Pierce Winter King’s Might but that’s basically just Pierce Forcewave imo
And yes I am referring to CS Casters
Well to be fair Pierce PB is pretty weak. But any other form of PB isn’t