The point is using spells for utility, not direct damage. You're right about cryo-orb; thatd make more sense than plasma beam for the build. I don't want to dip LTI and pay a penalty, but yeah that is also a good idea. The build's whole point is being an mt spear hybrid, so it tries to synergize those two things. I also wanted to make tacvests work; theres a bit of a theme going on here.
>TM sword, siphoner leather
>PK hammer, tungsten armor
>TC knife, stealthy leather
>MT spear, tacvest
riot would be more thematic but riot spear is just garbage imo
tacvest makes more sense I think; spears have melee defense, tacvests have bullet defense (though this one has little DT); the nanocomposite gives it some serious xbow/sniper protection and synergizes very well with all-in, which in turn boosts the kind of spread-out stat points this build has
The build looks like its all over the place, but it works as intended.
Btw, id wear stealthy infused pig leather armor until you find a good-enough nano