P.E.T. or Personal Electronic Toy is special gear, designed as your companion, which can provide you some additional buffs and makes your kits/buffs activate automatically.
PET V-1 can be obtained from missions or War Point Shop.
PET V-2 can be obtained from missions, Killmark Shop or by upgrading.
PET V-3 can be obtained from missions, Killmark Shop or by upgrading.
Can be Enchanted with Gamble Cards to add Prefix/Suffix.
PET Upgrade Card Fragments Card can be dropped from mobs/bosses or obtained from Killmark Shop, Boss Token Shop, Slotmachines and FFA Reward Capsule. They're also rewarded for completing Decca Kill Chain (killstreak).
You can craft PET Upgrade Card with 20x PET Upgrade Card Fragments.
Basic Crafting requires your PET V-1 and PET V-2 Upgrade Card. That has only 50% chances of successful craft.
You can get better percentage by adding PET V-2 Upgrade Card Fragments. You can add maximum of 30 pieces, which will give you 80% successful crafting percentage.
The same thing goes for upgrading your PET from V-2 to V-3, using PET V-2, PET V-3 Upgrade Card and PET V-3 Upgrade Card Fragments . Tho, the maximum PET V-3 Upgrade Card Fragments you can add is 20, changing the craft from basic 30%, to maximum 50% successful crafting percentage.
Auto Buff and Auto Kit Sockets are special items for PET that allows you to automatically use buff and kit.
They have special place in your Partner window (Gear Info>Partner). You can simply drag-drop them from your inventory there.
Enhancement are crafted from Enhancement Fragments, which drop during seasonal event. You can use Ancient Matter to get higher successful crafting percentage.
If you wanna change enhancement on your PET, first you need to remove existing PET effect from it (if there is one) with Default PET Effect card, purchased from Custom Cosmetic Shop. Then just combine your PET with new Enhancement Card.
PET Contour/Effect
You can apply contours and weapon effects for your PET. Visit Custom Cosmetic Shop in city for them. Then head out to Factory to combine them.