Build a Boss Upgrades
Build a Boss upgrade guide: what to upgrade first, upgrade priorities and the best upgrades to push your boss through every zone.
What are Upgrades?
Upgrades push your boss's stats and parts to the next tier. Choosing the right upgrade at the right time is the difference between clearing a zone and farming the same level for hours.
Why follow upgrade priorities?
Upgrade What Matters
Put cash into the stats and parts that actually raise your clear speed
Avoid Dead Ends
Skip trap upgrades that feel strong but stall your progression later
Scale Smoothly
Keep a steady upgrade path from zone 1 all the way to level 75
Featured & Essential
What to Upgrade First: Priority Guide for New Players
Learn what to upgrade first in Build a Boss — damage, sentries, survivability, and skill priorities ranked for fast early progression.
Build a Boss Upgrade Priority: Best Order & Tier Rankings
Learn the best Build a Boss upgrade priority order, which stats and abilities to level first, and how to build an efficient boss without wasting resources.
All Upgrades
Build a Boss Best Upgrades: Tier List & Priority Guide
Which upgrades matter most in Build a Boss? This priority guide ranks damage, gold, and boss-scaling upgrades so you spend resources efficiently.
Build a Boss Upgrade Guide: Best Skills, Parts & Cash Farming Tips
Learn the optimal upgrade order in Build a Boss: best skill map picks, gem upgrades, boss parts, and cash farming tips for fast progression.