Website and data research by 101Leafy.

How Last Bible III works out attack, magic, heal, and item numbers, and how the party grows. 101Leafy researched the game and checked each formula against real hits in battle.

Calculator

Formulas

1. Attack: attack value = 3 × Level + 3 × Stren + weapon attack. Defense value = 2 × Level + 3 × Endur + armor defense. Damage = attack value − defense value (at least 0), then the moon, then plus 0 to 5. A critical doubles it. Damage stops at 9999.
2. Monsters use their own Atk and Def in place of weapon attack and armor defense.
3. The moon: one eighth of the damage, rounded down, is taken off at the new moon and added at the full moon. Between the two nothing changes. Ilkara work the other way round.
4. The Luna Sword's power of 44 changes with the moon, from a quarter at the new moon to double at the full moon.
5. Hit chance: the weapon's accuracy, or 117 with no weapon, plus or minus the Speed step in the table below, kept between 0 and 127. At 127 the attack always hits. Below that it hits when a random number from 0 to 127 is under the chance.
6. A critical can only happen when the hit chance is 127. Halve both Lucks: if the attacker's is lower, there is no critical. Otherwise the chance is the attacker's half Luck + 13, at most 39, in 128. It doubles the damage after the 0 to 5 is added.
7. Attack magic: 2 × Intel + power − 2 × target's Intel (at least 0), then the moon, then plus 0 to 5, then the affinity.
8. Healing magic: 2 × power plus the smaller of Luck ÷ 2 and a random 0 to 255, so nearly always 2 × power + Luck ÷ 2.
9. Healing items: 2 × the power of the item's magic, plus 0 to 8.
10. Attack items: power plus 8 to 24, minus 2 × target's Intel (at least 0), then the moon, then plus 0 to 5, then the affinity.
11. Absorb heals the target by the damage, up to its max HP. Null makes it 0, and double makes it 2 ×.

Moon phase

The moon runs through 32 phases, and each phase falls on one of seven steps. Only the first and the last step change the damage.

Speed and hit chance

The attacker's Speed against the target's moves the hit chance. Weapons have an accuracy of 90, 96, 103, 112, or 115, and no weapon counts as 117.

Affinity

Each monster has an affinity for fire, ice, elec, and force. The monster pages list absorb as special.

EXP for each level

Total EXP to reach each level on the base curve. Each party member and race adds (level − 1) × its EXP factor ÷ 2 to it, rounded toward 0. Everyone reaches the cap of 999999 at level 66.

Party growth

Each level-up adds Endur + level × HP factor ÷ 4 (at least 1) to max HP, up to 9999, and (Intel + level × MP factor ÷ 8, at least 1) ÷ 2 to max MP, up to 255. The level is the new one, and the divisions round down.

Growth by race

Monsters in the party grow by their race, with the same formulas.

Stat points

Each level gives one stat point, and a stat stops at 50. Yuri puts the point where the player chooses. Everyone else follows a fixed order of seven steps that repeats.

Level-up planner

Pick a party member, the level now, and the goal level. For Yuri, put in where the points go. For the others, pick the step of the order that their next point lands on. Max HP and MP come out as a range: the low end counts each new point from the next level up, and the high end from the level it is gained on.