You start fight like any tank builds, just go in and let them come.7 will is force user, stoi, and iron will (possible fight response).Spear is strong featless as sledge, its armor penetrating, block granting melee which nice to get, which gets better with out of leveling feats.There is a huge difference between having zero and 10-20 mp because you can come out of cover and burst then go back to cover.With stoi, tempered element, morphine aegis, doppels deal zero damage to you so you have less reasons to fear them.About guns, skill come from versatility and you need just soent 80 points to get your ranged feats
Again - Tempered is a Feat. Wasn't in your build. Stoicism depends on damage taken already, so is not a perma 20% reduction say (near death). Morphine and Aegis - fine. All build can pop it. Morphine lasts 2 turns, and you have no way to kill them and no way to wipe all TC'ers thanks to low mobility, low Initiative. I might be wrong, but had enough fights and seen enough fights to know what is a Reload.
If you could, like say KnifeGafs 10CON 11PER AR build - stealth in, shred and then fight with good MP - sure, legit. He also had ambush (50% Evasion reduction), to compensate for skill loss on 11PER. Your build has what? 178 skill lvl30. On DOMINATING?
There is a TON of fights, where you can't get into good postion with corners without stealth. You start in the open. Vathosphore armor has 15DT, 38% Phys Resist. All of your enemies start first, unless you roll real super nice.
You must be a troll. How is this gimpage an OP build??
Go AR tin-can with 6DEX with Paranoia and Trigger Happy + Soda(31 total Init), 40Stealth to Ambush, Grenadier and Incendiary Grenades. You will do MORE than this build ever can. You can 9STR, 4INT, 10 Con, 13PER or 12CON and 11PER and you will do fine. 255 to 282 Gun Skill, all feats, TM and whatever shit you want. Shit, drop little bit of CON, get 6INT, Armor Sloping and you are laughing.
Here:
https://underrail.info/build/?HgkGAwgLAwbCoFAAAAAAKDo0QwBubi8tMgAAAEYAAFAowoNFFhUCSitVScOMwocmO09L378 - 311 Skill points left over.
Sorry man. I can't see this as a working build. It is too much of jack-of-no-trades. And that Vathosphore armor is just a poor-mans Biohazard Anti-Rifle Tac Vest. It may work, but no way is it OP, at least in my honest opinion.