Topic: HP Damage Algo

[Deathlike2]

The HP based absorb formula is being applied perfectly to FF2 SNES via the Firebomb vs the Red Dragon. The Red Dragon has 0 magic defense, so the numbers are between 64 and 96.

[Dragonsbrethren]

I'm going to have to do a few more tests but it seems to be consistent with what I'm seeing in Easy Type as well.

[Deathlike2]

I don't think the battle engine has changed between the versions (other than the Stop and Sleep/Paralysis bug).

I'm more interested in the GBA tests to see if I'm on target.

[Deathlike2]

Looks like I was wrong a bit on the GBA's HP Absorb formula..

It's actually much simpler than that...

Damage = currentHP * maxHP modifier / 25

and then...

Damage = Damage + ((Damage * rand(100,150)/100) % 256) - Target's Magic Defense

To resummarize the SNES's HP Absorb forumla..

Damage = (maxHP modifier * 4 * rand(100,150)/100 - Target's Magic Defense) * Spell Multiplier

In looking at this, it's really pluging it into the regular spell damage formula...

 

The GBA absorb formula looks very much like current HP damage formula (well, particularly the Blue Dragon's Blizzard/Ice Storm attack), except that ignores Magic Defense.

[Deathlike2]

In testing the SNES Blue Dragon's Blizzard attack...

It seems like the resistance/immunity modifier is applied late..

Damage = curHP / curHP modifier

Damage = Damage + ((Damage * rand(100,150)/100) % 256)

Then, based on the elemental resistance...

Resistance:
Damage = Damage * 1/2

Immunity:
Damage = Damage * 0

Absorb seems to follow a different formula...

[Deathlike2]

Wow, the Absorb formula for SNES Blue Dragon's Blizzard is really really familiar..

Damage = (curHP modifier * 4 * rand(100,150)/100 - Target's Magic Defense)

It's really more like this..

Damage = (curHP modifier * 4 * rand(100,150)/100 - Target's Magic Defense) * Spell Multiplier

Since the Blue Dragon has a 1x spell multiplier...

Ok, that seems to be resolved...