The Father, The Son, and the Holy Spear it: Trinity Pin lock Tactician

TL;DR: Perma Stun bosses, Clears like 3 screens away on any map, Versatile Skill choice (can swap LS for any good projectile skill/weapon!)
Disclaimers:
- I'm not a "pro". This is not a min max, 3 billion DPS POB hyper optimized build. This is me trying to have fun and cooking something semi-viable with my favorite class, mercenary.
- I don't have a POB or maxroll because I have very little free time.
POENINJA: Builds - JordenTactics - poe2.ninja
So basically, I'm a mercenary only player and after finishing my witchhunter I wanted to give tactician a shot. I had three goals.
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I didn't want to play ballista or siege cascade.
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I wanted to abuse The pin notable.
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I wanted to try and make trinity usable with the reduced spirit cost.
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I didn't want to follow any guides, just try to make it work on my own. Work = T15 and pinnacle content viable.
This is what I came up with, and I'm very pleased with how it plays. The best part is that it works with ANY projectile damage skill, so you don't have to use LS. I tested it with other spear skills and works just as well, but the clear is noticeably less "bonkers".
Comments
So, where's the actual showcase?
U really just need beacon if azis or something to balance trinity when mobs have one negative resist.
Can u eli5 trinity ?