How do percentage buffs stack in Tyr?

Same-type percentage buffs always stack additively into a shared pool rather than compounding. Two +5% damage buffs yield +10% total, not 1.05 multiplied by 1.05.

What is the damage multiplier for High Explosive shells?

High Explosive shells apply a 1.20 multiplier to your true shell damage. Other documented shells include Standard (1.0), Gargantuan (1.2 with much worse accuracy), Momentum (1.3 after 200m of travel), and Unstable (1.1 with a restricted max speed).

How do enemy defenses reduce damage?

Enemy defensive components multiply in sequence: for example Adaptive Hardening reduces incoming damage by a percentage while you are spotted, and Micro Plating subtracts a flat amount. Each defensive layer compounds rather than adding.

Tyr Damage Calculation Guide: Shell Math & Defense Chain

Tactical Overview

Combat in Tyr is governed by deterministic formulas rather than random damage spreads. This guide explains the order of operations every shot follows, based on the community-verified damage math compiled by Tyr HQ. The exact percentages and base values are illustrative per vehicle; the order and the math run the same way for every shot.

The Outgoing Damage Pipeline

Every projectile fired in Tyr follows a fixed sequence from firing to impact:

Step	Operation	Example
Step 1: Flat Base Sum	Base shell damage + flat talent and component bonuses	200 + 10 + 5 + 7.5 = 222.5
Step 2: Percent Pool	Add same-type percentage buffs into one pool, apply once	222.5 × 1.0 (no percent buff active)
Step 3: Shell Multiplier	True shell damage × ammunition modifier	222.5 × 1.20 (High Explosive) = 267
Step 4: Defense Chain	Enemy defense components reduce damage in sequence	267 × (1 − 0.08) − 3 = 242.64 → 243

Step 1: Flat Stat Accumulation

Flat bonuses from talent trees and mounted components add directly to the base shell damage. Example from a real loadout documented by Tyr HQ:

200 (base) + 10 (Shell Damage talent) + 5 (Duplicator) + 7.5 (Shell Charger) = 222.5

Flat additions are always applied before any percentage scaling.

Step 2: Additive Percentage Stacking Rule

Percentage buffs of the same type never compound in Tyr. Multiple sources granting percentage increases to the same attribute are pooled into a single additive factor, then applied once.

Example for maximum health:

Base HP: 2050 (Atlas)
Flat Max Health talent: +200 HP
Subtotal: 2250 HP
Bulkheads component: +8.5% max health
Combined modifier: 8.5%
Final health pool: 2250 × 1.085 = 2441.25

If a second +5% health buff existed, it would combine as 8.5% + 5% = 13.5%, applied once (2250 × 1.135), never compounding multiplicatively. Same-type percents always share one pool.

Step 3: Ammunition Modifiers

Once true shell damage is determined, the loaded ammunition applies its dedicated multiplier. Documented shells from the Tyr HQ database:

Shell Type	Damage Multiplier	Trade-off
Standard	1.00	Base firepower
High Explosive	1.20	Fixed penetration, no other penalty listed
Gargantuan	1.20	Much worse accuracy
Momentum	1.30	Only after the shell has traveled 200m
Unstable	1.10	Restricted max speed

Loading High Explosive with the 222.5 true damage example produces:

222.5 × 1.20 = 267.0 Muzzle Damage

Tyr Artillery Battery Discharging Heavy Shells

Step 4: Enemy Defense Chain

Once the shell arrives, the target’s defenses run in sequence, multiplying one after another. This is the opposite of shooter-side buffs: your offense adds up, while the enemy’s defense multiplies.

Example from a real loadout:

267 ← shell damage that arrived
× (1 − 0.08) = 245.64 ← Adaptive Hardening (−8% while spotted, ramps to a cap)
× (1 + 0) = 245.64 ← no module-hit bonus this shot
− 3 = 242.64 ← Micro Plating flat reduction

Rounded: 243 damage.

If a target stacks Adaptive Hardening (−8% while spotted) and Reactive Modules (−10% after a module is broken), that is 0.92 × 0.90 = 0.828, a 17.2% reduction, not 18%. Defensive layers get stronger per layer; offense gets weaker. This is the core balance lever in the game.

Conditional Effects on the Same Shot

Some effects fire on the hit itself rather than changing your next shot. Two patterns are documented:

Conditional multipliers (for example, module damage bonuses): they join the hit-resolution chain in Step 4 when their condition matches, and compound alongside enemy defenses.
Additional damage instances (a separate bonus hit on penetration): the bonus runs its own pass through defenses, and the totals add at the end.

Neither joins the shooter-side percentage pool, which is why on-hit damage bonuses often feel stronger than the same number written as a passive buff.

Concrete Combat Calculation Scenarios

Scenario A: Ranger with High Explosive vs an angled heavy

Chassis: Ranger (195 base cannon damage, 70 penetration)
Flat additions: Duplicator (+5) + Shell Charger (+7.5) = 207.5 Base Sum
Ammunition: High Explosive (1.20x) = 249.0 Muzzle Damage
Target defenses: 8% Adaptive Hardening, 3 flat Micro Plating
Final impact: 249.0 × 0.92 − 3 = 226.08 → 226 HP damage

Scenario B: Arbalest alpha strike vs a light tank

Chassis: Arbalest (400 base cannon damage, 100 penetration)
Flat additions: none
Ammunition: Standard Shell (1.00x) = 400.0 Muzzle Damage
Target defenses: none active
Final impact: 400.0 HP damage (47% of a light tank’s 850 HP pool)