BUNNYBastion Best Upgrades Guide

Understanding Upgrade Tiers in BUNNYBastion

In BUNNYBastion, each run lasts roughly 10 minutes, and your success hinges on choosing the right upgrades from the pool offered between waves. Upgrades are broadly categorized into offensive, defensive, and utility types. The best upgrades are those that either scale exponentially with your current build or provide a unique effect that no other upgrade can replicate.

We have analyzed the upgrade pool based on early access data and community feedback. Below is our definitive tier list for the best upgrades you should prioritize.

S-Tier: Must-Pick Upgrades

These upgrades are so powerful that you should almost always take them, regardless of your current class or build.

Multi-Shot
This upgrade adds an extra projectile to your primary attack. The damage increase is multiplicative with other damage bonuses, making it the single best offensive upgrade in the game. It synergizes perfectly with any on-hit effects.

Barrier Nova
When your shield breaks, this upgrade releases a shockwave that deals 50% of your defense as damage to all nearby enemies. It provides both a safety net and a massive area-of-effect clear, which is invaluable during late-wave swarms.

Life Steal
Recover 2% of your maximum health per enemy killed. In a game where health recovery is limited, this upgrade turns your offensive output into sustained survivability. It is especially strong on high-attack-speed builds.

A-Tier: Strong Synergy Builders

These upgrades are excellent choices when they complement your existing loadout or fill a gap in your defenses.

Chain Lightning
Your attacks have a 20% chance to chain to two additional enemies. This upgrade excels when you are facing tightly packed groups. Combine it with Multi-Shot for devastating crowd control.

Temporal Shield
After using your active ability, gain invulnerability for 1.5 seconds. This allows you to safely reposition or continue attacking during dangerous enemy attack patterns. It is a top pick for aggressive playstyles.

Double Gold
All gold pickups are doubled for the remainder of the run. Gold is used to purchase additional upgrades and reroll options at the end of each wave. Securing this upgrade early snowballs your economy, letting you buy more upgrades later.

B-Tier: Situational but Viable

These upgrades are effective in specific scenarios or with particular character builds.

Thorns Aura
Deal 10 damage per second to all enemies within melee range. While the damage is modest, it provides passive wave clear when you are focused on dodging. It is best used on tanky builds that stay in the thick of combat.

Speed Boost
Increase movement speed by 15%. While not directly increasing damage, mobility is crucial for avoiding enemy projectiles and repositioning. This upgrade is a comfort pick for players struggling with survivability.

Recycling
When you sell an upgrade, you recover 50% of its cost. This allows you to experiment with different builds without being punished for a bad choice. It is a great safety net for newer players.

C-Tier: Avoid Unless Necessary

These upgrades offer minimal impact or are outclassed by other options in the same pool.

Minor Health Boost
Gain 20 maximum health. The increase is negligible compared to percentage-based health upgrades or life steal. It rarely makes a difference in surviving a hit.

Single Target Focus
Increase damage to the first enemy hit by 30%. While it sounds good, the effect is wasted on groups and does not scale as well as multi-target upgrades.

Best Upgrade Synergies

To truly dominate in BUNNYBastion, you need to combine upgrades that work well together.

The Glass Cannon Build
Prioritize: Multi-Shot > Chain Lightning > Double Gold > Life Steal. This build focuses on overwhelming firepower, with Life Steal as your only sustain. It clears waves faster than any other setup.

The Immortal Tank Build
Prioritize: Barrier Nova > Temporal Shield > Thorns Aura > Life Steal. This build relies on surviving through shields and passive damage. You will clear waves slower but are nearly unkillable.

The Economy Build
Prioritize: Double Gold > Recycling > Speed Boost > Multi-Shot. This build maximizes your gold income, allowing you to reroll for the best upgrades every wave. It is a high-risk, high-reward strategy.

Final Tips for Choosing Upgrades

Always consider your current class and playstyle. For example, a class with low base health benefits more from Life Steal than a tanky class. Similarly, if you are struggling with a specific enemy type, look for upgrades that counter them.

Check our Beginner Guide for more foundational tips, or the Class Guide to understand which classes pair best with these upgrades.

Remember, the best upgrade is the one that keeps you alive and lets you deal damage. Adapt your choices based on the enemies you face and the upgrades you have already taken. Good luck, and happy defending