INTRODUCTION
The reason behind this build is to create a truly pirecing laser using pierce damage. Because of limited conversion possibilities AAR is not an option, so I went for Obliteration from Tome of Arcane Wastes. Infiltrator is a natural choice for a piercing build. For conversion from elemental to piercing damage I use two Bladetwister Signet rings and Pack of Treacherous Means belt. For survival build uses Bat, Ghoul and Scales. Vitality is partly converted to piercing with Murderer’s Epaulets monster infrequent shoulders. These shoulders are absolutely necessary. Everything else is picked to make the stats of the build OK. Gameplay is first use Horn of Gandarr for damage reduction to enemies then Word of Pain for resistance reduction and then pierce with laser 
You have two healing skills on standby so use them wisely + Inquisitor’s Seal. Build is susceptible to heavy physical hits but with careful timing of healing skills you can withstand them or you can avoid them with Displacement. Performance of the build strongly depends on your good timing of using skills. You can facetank most of the time in SR. Build is capable of doing SR 65-66.
I have other laser builds here. All my builds are here.
Here is a list comparing all my laser builds from best to worst. All are at least SR 65-66 capable.
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Albrecht the Leech – great build, aether AAR, powerful both offensively and defensively (quite tanky)
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Albrecht the Chaotic – great build, chaos AAR, offensively noticably weaker than Leech, defensively a little weaker than Leech (this one is very tanky but slower)
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Albrecht the Mental – great build, elemental AAR, offensively a little better than Leech, defensively noticably weaker than Chaotic
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Albrecht the Tank – good build, fire AAR, offensively similar to Chaotic, defensively noticably weaker than Chaotic (but better than Mental)
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Olexrian Judge – good build with nice gameplay from freezing enemies, physical Obliteration, offensively noticably weaker than Chaotic, defensively noticably weaker than Tank
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Judge Obliterator – good build, physical Obliteration, offensively a little weaker than Olexrian Judge (the weakest offensively of my laser builds), defensively a little better than Olexrian Judge (but a little weaker than Mental)
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Albrecht von Frozenstein – good build with nice gameplay from freezing enemies, fire AAR + OFF, offensively similar to Tank, defensively noticably weaker than Judge Obliterator
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Albrecht the Freezer – good build with nice gameplay from freezing enemies, fire AAR + OFF, similar to Frozenstein both offensively and defensively
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Pierce Mage – OK build, pierce Obliteration, offensively a little better than Judge Obliterator (and a little weaker than Olexrian Judge), defensively a little weaker than Frozenstein
GRIMTOOLS https://www.grimtools.com/calc/DV9LkEP2
There are two monster infrequent items in this build - Murderer’s Epaulets and Dermapteran Slicer. Both are easily farmable. On the shoulders you want physical resistance and OA. On the sword you want casting speed. I have chosen the best affixes so that they are not double rare. You also need Ravager’s helm. You can farm it from Ravager of Flesh on elite difficulty with another character. There are also six craftable items - belt, medal, boots, gloves, pants and amulet. I have picked four crafting bonuses to slow resistance, one to stun resistance and one to physique.
Stats of the build
OFFENSE
OK piercing damage 2000 %
OK critical damage 34 % for Infiltrator (up to 109 % with Obliteration and Deadly Aim)
lower base OA - 2900 OA (over 3500 OA with Deadly Aim and Inspiration)
55 DA reduction to enemies from Annihilation
big pierce resistance reduction from Assasin’s Mark, Veil of Shadow, Obliteration, Word of Pain, Mark of the Blade (from ring) and Ravager’s Deathgaze (from helm) - up to -148 %
other sources of damage - Word of Pain, Horn of Gandarr, Shifting Sands and Sand Devils
DEFENSE
OK life 13000 HP
big base DA around 2950 DA (goes to around 3050 DA with Inspiration)
up to -325 OA shred to enemies - 55 OA shred from Annihilation, 140 OA shred from Shifting Sands and 130 OA shred from Veil of Shadow
reasonably overcapped resistances
high CC resistances with crafting bonuses
capped disruption resistance using Arcane Harmony Leggings
OK armor around 1950
nice physical resistance 27 % (with physical resistance roll on shoulders)
healing on standby from Pneumatic Burst and Word of Renewal
healing from Bat and Scales (partial vitality converted to piercing using shoulders)
Ghoul
% damage reduction from Horn of Gandarr
flat damage absorption from Inquisitor’s Seal
up to 83 % dodge chance with Windshear active
Prismatic Rage from component
Blade Barrier (saves the day when things go tough)
20 % cooldown reduction
image from the game with passive buffs + Pneumatic Burst, Word of Renewal and Inquisitor’s Seal
image from the game with passive buffs + Pneumatic Burst, Word of Renewal, Inquisitor’s Seal, Inspiration and Deadly Aim
SR, CRUCIBLE
I play SR with camera pointed away from enemies and I try my builds only in SR 65-66 and SR 80. I play around 10 SR runs per character.
This build does SR 65-66 relatively easily. Performance depends on your timing of using skills. Build is demanding on the player. Enemies go down relatively fast. You can facteank most of the time in SR. Toughest enemy for this build is the Reaper. In SR 80 it can do first three shards and gets destroyed by physical hitters in boss room.
I don’t play Crucible so I don’t have a time number for it.
FOOD FOR THOUGHT
I have tried to make a piercing AAR using only elemental conversion to piercing (aether is not available in the game). Damage should be on par with Obliteration this way if one can manage to make the stats good. I was not able to do it. Perhaps someone can make it better. I have not given it that much thought. Here is what I created in grimtools. https://www.grimtools.com/calc/qNYoYXBV
But the sword will be better damagewise. Nice flat damage for healing skills that use % WD.