Girls Frontline 2: Exilium – Damage Calculation Guide

Formulas for Number Nerds

By jack_zhan01.

Damage Calculation

What numbers do I use?

The stats you see in the refitting room are calculated with all flat and percentage buffs from weapons, keys and attachments. These will be your base stats before in-battle buffs.

All stats involved in the formulas below are the numbers on the in-battle detailed view, i.e. after buffs/debuffs.

The Formula

There is no damage fluctuation. You either crit, or don’t crit.

Damage = BASE_DAMAGE * DEF_MODIFIER * CRIT_MODIFIER * WEAKNESS_MODIFIER * BUFFS * COVER_DAMAGE_REDUCTION + FIXED_DAMAGE

• BASE_DAMAGE
  • This is the part of the skill description that says something like “100% of ATK” or “60% of HP”. Simply multiply the percentage with the stat.
• DEF_MODIFIER
  • Damage reduction via the defense stat.
    • DEF_MODIFIER = ATK / (ATK + DEF)
  • Both ATK values are of the attacking party. The DEF value is of the receiving party.
  • All defense buffs, debuffs, and defense pierce are calculated additively, then multiplied with the base DEF stat.
• CRIT_MODIFIER
  • Damage increase from crit hits.
    • CRIT_MODIFIER = 100% (if it’s not a critical hit)
    • CRIT_MODIFIER = CDMG (if it’s a critical hit)
  • Crit damage is used directly as a percentage, i.e. 120% crit damage = 1.2x damage on crit
• WEAKNESS_MODIFIER
  • If no weakness is exploited
  • If weapon type OR elemental weakness is exploited (+2 stability damage)
  • If BOTH weapon type AND elemental weakness are exploited (+4 stability damage)
• BUFFS
  • Everything that says “increase damage by x%” and “decrease damage by x%”
  • This includes effects on both the attacking party and the receiving party
  • These are all calculated additively on top of a base of 100%
• COVER_DAMAGE_REDUCTION
  • COVER_DAMAGE_REDUCTION = 1 – STABILITY_MODIFIER – COVER_MODIFIER
  • If the party getting attacked is behind a cover, AND
    • If their stability is still above 0 after stability damage, STABILITY_MODIFIER = 60%
    • If their stability is 0 after stability damage, AND
    • The damage type does not exploit a weapon type or elemental weakness, STABILITY_MODIFIER = 60%
    • The damage type exploits a weakness, STABILITY_MODIFIER = 0%
    • If their stability is 0 before the attack, STABILITY_MODIFIER = 0%
  • If the party getting attacked is NOT behind a cover, STABILITY_MODIFIER = 0%
  • If the party getting attacked is behind a cover, regardless of their stability value, they will get a COVER_MODIFIER
    • Depending on the type of cover, COVER_MODIFIER can be 20% – 35%.
    • Skills that ignore part of cover damage reduction are calculated additively with this value.
• FIXED_DAMAGE
  • Everything that says “fixed damage”, e.g. Suomi’s ult.
  • These damage will ignore all modifiers from (de)buffs, covers, and defense.

Combat Effectiveness

CE = (5 * ATK + 4 * HP + 3 * DEF) * (0.1 * CRIT + 0.2 * CDMG + 0.01 * NUMBER_OF_FIXED_KEYS + 0.01* NUMBER_OF_FORTIFICATIONS + 0.008* NUMBER_OF_CALIBRATIONS)

• All non-percentile numbers, including the final CE number, are rounded up to the next integer
• Crit rate and crit damage are used as is with the percentile sign
• NUMBER_OF_FIXED_KEYS = 0-3 (only fixed keys, i.e. the left side, are counted)
• NUMBER_OF_FORTIFICATIONS = 0-6 (the “V” number)
• NUMBER_OF_CALIBRATIONS = 1-6

Timing of Stability Damage

When you exploit a weakness, you will see “prioritized stability damage dealt”. What is this?

• When the attack does not exploit a weakness, stability damage is calculated after the damage of the attack.
• When the attack exploits one or more weaknesses, stability damage is calculated before the damage of the attack. This affects a couple of things:
  • If this attack causes a stability break, the damage of this attack will not be subject to damage reduction from stability
  • If the boss has some damage reduction effects based on stability,
    • “-80% damage taken if stability > 0” —-> this attack won’t be affected if it causes a stability break
    • “-5% damage taken for every point of stability” —-> this attack will do more damage because stability is deducted before the damage reduction is calculated

How Do Buffs Work

Different types of in-battle buffs are displayed differently:

• Auras (e.g. ice damage bonus for all allies from Suomi sig) will show up as buffs.
• Non-conditional weapon skills that affects only self (e.g. “+10% ice damage” from Makiatto’s sig) will show up in the in-battle detailed view, but not as buffs. When triggered, it will say “Triggered <skill name>”
• Traits such as defense pierce and stability pierce do not show up in the in-battle detailed view. When triggered, it will say “<weapon name> Triggered “
• Conditional weapon skills & traits, set effects, and key effects (e.g. “+2.5% damage against <faction>” or “+7% damage when xxx”) do not show up in the in-battle detailed view. When triggered, it will say “Triggered <set name>” or “Triggered Fixed/Common Key – <key name>”

All buffs and debuffs to the same stat (e.g. ATK) are calculated additively, then multiplied with your base stat. If a stat is affected by buffs/debuffs, it will show as yellow/red respectively in the detailed view. Note that if buffs and debuffs completely cancel out each other (e.g. you have a +10% debuff and +10% buff), it will show as white (unaffected).