Website and data research by 101Leafy.

How Last Bible II works out attack, spell, and heal numbers, and how the party grows. 101Leafy researched the game and checked each formula against real hits in battle. The numbers are for the Game Boy Color version; the Game Boy version is the same except where a table says GB.

Calculator

Formulas

1. Attack, per swing: attack value = 3 × Level + 2 × Stren + Attack + weapon power. Defense value = Level + 2 × Endur + Defense + armor + shield. Damage = the moon phase applied to (attack value − defense value, at least 0), then plus 1 to 3.
2. A party member with a weapon swings as many times as the weapon says, and every swing is added into one number. Bare hands and monsters have their own swing count, most often 1.
3. Hit chance: the weapon's hit, or 50 with no weapon, plus the Speed step in the table below, kept between 0 and 100.
4. A critical is only possible when the hit chance is exactly 100. The chance is Luck ÷ 2 + 10, at most 30, and it doubles the whole attack. A monster only gets the roll when its Luck is at least the target's.
5. Defending halves the damage taken, after the 1 to 3 is added. Monster eggs never break: the damage stops at their HP − 1.
6. Spells: value = power + 2 × caster's Intel − 2 × target's Intel. Below 0, the spell does nothing at all. Otherwise damage = the moon phase applied to (value × the affinity row's percent), then plus 1 to 3.
7. Heals restore the base amount plus 0 to the target's Intel. Death Touch drains 2 × (0 to the target's Intel). No item does damage.
8. Holy 1, Holy 2, and Holy 3 go off on the 2nd, 3rd, and 4th cast in a row by the same caster; doing anything else starts the count again. Force goes off when two party members cast it in the same turn.

Moon phase

The moon changes attacks and spells after the base damage and before the 1 to 3. The part added or taken off is rounded down.

Speed and hit chance

The attacker's Speed against the target's changes the hit chance.

Affinity rows

Each monster has a row for fire, ice, elec, and force. Monsters use row 0 (drain), 2 (null), 4 (normal), and 6 (weak). Almighty spells always use row 4.

Spell power

The breaths are monster moves and cost no MP.

	Power	MP
Fire	20	2	Fire
Blaze 1	40	5	Fire
Flare 1	80	14	Fire
Blaze 2	150	17	Fire
Flare 2	200	25	Fire
Freeze	20	2	Ice
Ice 1	40	5	Ice
Icy 1	80	14	Ice
Ice 2	150	17	Ice
Icy 2	200	25	Ice
Geo	20	2	Elec
Shock 1	40	5	Elec
Spark 1	80	14	Elec
Shock 2	150	17	Elec
Ziodyne	200	25	Elec
Impact 1	20	2	Force
Impact 2	40	5	Force
Impact 3	80	14	Force
Zanrama	150	17	Force
Zandyne	200	25	Force
Holy 1	250	1	Almighty
Holy 2	450	2	Almighty
Holy 3	1000	3	Almighty
Force	600	10	Almighty
Force 1	300	5	Almighty
Force 3	1200	15	Almighty
Fire Breath	30	-	Fire
Fire Breath	100	-	Fire
Ice Breath	30	-	Ice
Ice Breath	100	-	Ice
Shock Breath	30	-	Elec
Shock Breath	100	-	Elec
Impact Breath	30	-	Force
Impact Breath	100	-	Force

Heals

Base amounts. A random 0 to the target's Intel is added on top.

EXP for the next level

Total EXP a party member needs to reach the next level. With all five stats at 40 the game shows FFFFFF instead.

Spells learned by max MP

Party members learn spells when their max MP reaches the number, not at a level. Zodia learns nothing in the Game Boy version.

Level-up planner

Each level-up adds Endur to max HP (up to 9999) and Intel ÷ 4 to max MP (up to 255), and then gives one point to put into a stat. A stat can't go past 40. Points put into Endur and Intel early give more HP and MP, so the planner shows both orders.