Combat Mechanic

Combat in Remixed Dungeon is a complex system that combines attacking, defending, and damage calculation mechanics.

Combat in Remixed Dungeon involves a two-step process:

1. **Hit Detection**: Determine if an attack successfully hits the target
2. **Damage Calculation**: Calculate the final damage after considering armor and other factors

The hit detection is calculated in CharUtils.java:

// In CharUtils.java
float acuRoll = Random.Float(attacker.attackSkill(defender));
float defRoll = Random.Float(defender.defenseSkill(attacker));
boolean hit = (magic ? acuRoll * 2 : acuRoll) >= defRoll;
 
if (hit) {
    // Attack hits
    int damage = attacker.damageRoll();
    defender.damage(damage, attacker);
} else {
    // Attack misses
    defender.defenseProc(attacker, 0);
}

Note that for magic attacks, the attacker's roll is multiplied by 2, making magic attacks more likely to hit.

The attack skill is calculated in Char.java:

public int attackSkill(Char target) {
    int[] bf = {0};
    forEachBuff(b -> bf[0] += b.attackSkillBonus(this));
 
    int bonus = bf[0];
    float accuracy = (float) Math.pow(1.4, bonus);
 
    if (target == null) {
        target = CharsList.DUMMY;
    }
 
    if (rangedWeapon.valid() && level().distance(getPos(), target.getPos()) == 1) {
        accuracy *= 0.5f;
    }
 
    float mainAccuracyFactor = getActiveWeapon().accuracyFactor(this);
    float secondaryAccuracyFactor = getSecondaryWeapon().accuracyFactor(this);
 
    float skillFactor = Utils.min(20f, mainAccuracyFactor, secondaryAccuracyFactor);
 
    int aSkill = (int) ((baseAttackSkill + lvl()) * accuracy * skillFactor);
 
    return aSkill;
}

The defense skill is also calculated in Char.java:

public int defenseSkill(Char enemy) {
    int defenseSkill = baseDefenseSkill + lvl();
 
    final int[] bf = {0};
    forEachBuff(b -> bf[0] += b.defenceSkillBonus(this));
 
    int bonus = bf[0];
 
    float evasion = (float) Math.pow(1.2, bonus);
    if (paralysed) {
        evasion /= 2;
    }
 
    int aEnc = getItemFromSlot(Belongings.Slot.ARMOR).requiredSTR() - effectiveSTR();
 
    if (aEnc > 0) {
        return (int) (defenseSkill * evasion / Math.pow(1.5, aEnc));
    } else {
        if (getHeroClass() == HeroClass.ROGUE) {
            if (getCurAction() != null && getSubClass() == HeroSubClass.FREERUNNER && !isStarving()) {
                evasion *= 2;
            }
 
            return (int) ((defenseSkill - aEnc) * evasion);
        } else {
            return (int) (defenseSkill * evasion);
        }
    }
}

After a successful hit, damage reduction is calculated in the defenseProc method of the Char class:

public int defenseProc(Char enemy, int baseDamage) {
    int dr = defenceRoll(enemy);
 
    final int[] damage = {baseDamage - dr};
 
    forEachBuff(b -> damage[0] = b.defenceProc(this, enemy, damage[0]));
    damage[0] = getItemFromSlot(Belongings.Slot.ARMOR).defenceProc(enemy, this, damage[0]);
 
 
    if (getOwnerId() != enemy.getId()) {
        setEnemy(enemy);
    }
 
    return getScript().run("onDefenceProc", enemy, damage[0]).optint(damage[0]);
}

The damage reduction (dr) is calculated in the defenceRoll method:

public int defenceRoll(Char enemy) {
    if (enemy.ignoreDr()) {
        return 0;
    }
 
    final int[] dr = {dr()};
    forEachBuff(b -> dr[0] += b.drBonus(this));
    return Random.IntRange(0, dr[0]);
}

The base damage reduction is calculated from the equipped armor using its defenceProc method:

public int defenceProc(Char attacker, Char defender, int damage ) {
    if (glyph != null) {
        damage = glyph.defenceProc( this, attacker, defender, damage );
    }
 
    if (!isLevelKnown()) {
        if (--hitsToKnow <= 0) {
            setLevelKnown(true);
            GLog.w(StringsManager.getVar(R.string.Armor_Identify), name(), toString() );
            Badges.validateItemLevelAcquired( this );
        }
    }
 
    return damage;
}

The armor's effective DR (Damage Reduction) is calculated as: tier * 2 + level() * tier + (glyph != null ? tier : 0), where tier represents the armor's base type (Cloth: 1, Leather: 2, Mail: 3, etc.).

• Function: Determines the chance to successfully hit an enemy
• Factors: Base attack skill, level, attack skill bonuses from buffs, weapon accuracy factors
• Formula: (baseAttackSkill + lvl()) * Math.pow(1.4, attackSkillBonuses) * weaponAccuracyFactor
• Reference: Attack Skill Mechanic

• Function: Determines the chance to successfully evade an attack
• Factors: Base defense skill, level, defense skill bonuses from buffs, armor encumbrance, paralysis status
• Formula: (baseDefenseSkill + lvl()) * Math.pow(1.2, defenseSkillBonuses) * class_modifiers
• Reference: Defense Mechanic

• Function: Reduces incoming damage from successful hits
• Factors: Base armor value from equipped armor, armor bonuses from buffs
• Formula: Damage reduction based on armor value relative to attack skill
• Reference: Armor Class

• Function: Complete avoidance of damage when defense skill roll > attack skill roll
• Result: No damage taken
• Reference: Evasion Mechanic

1. Attacker rolls a random value between 0 and ''attackSkill(defender)''
2. Defender rolls a random value between 0 and ''defenseSkill(attacker)''
3. If ''attackerRoll > defenderRoll'', the attack hits
4. If ''defenderRoll >= attackerRoll'', the attack is evaded

1. If attack hits, damage is calculated considering armor
2. Armor reduces the damage according to the damage reduction formula
3. The final damage is applied to the defender's health

• Paralysis: Reduces evasion by 50% for the paralyzed character
• Blessed: Increases attack skill bonus
• Other Buffs: Various temporary effects that modify combat stats

• Accuracy Factor: Affects attack skill calculation
• Damage Range: Determines the potential damage dealt
• Speed: Affects attack frequency

• Armor: Reduces incoming damage
• Rings: Various combat-relevant bonuses
• Enchantments: Weapon and armor enchantments provide special effects

• Attack skill > Defense skill roll
• Damage is calculated with armor reduction
• Target takes reduced damage

• Defense skill > Attack skill roll
• Target takes no damage
• Some classes may have special effects on evade

• Not a standard mechanic in Remixed Dungeon (unlike some other roguelikes)
• Damage is determined by weapon damage range and modifiers

• Java: Char.java
• Java: CharUtils.java
• Java: Hero.java

• Attack Skill Mechanic
• Defense Mechanic
• Evasion Mechanic
• Armor Class
• Accuracy Mechanic