Phantasy Star IV Item drops and rate

[lorenzo]

I finished making the list for item drops and their rate for every enemy. If you come across an item that's not in the list, let me know.

I will also repeat what I said in other posts so everything is in one place: item drops are part of the enemy formation data, not enemy data. Enemy formations are compressed in ROM so it's not possible to edit them directly. The compression algorithm is Kosinski so you need to find a decompression tool for that and then edit the data and re-compressed the data in ROM. Alternatively I'm planning on storing the decompressed data in ROM so it's possible to edit them in the disassembly, however I don't know when I'll start working on it.

Here's the list:

Monster Fly: Antidote, 6.25%
Flatter Plant: Antidote, 18.75%
Toad Stool: Cure Paral, 12.5%
Gicefalgue: Antidote, 12.5%
Guilgenova: Antidote, 12.5%
Ismounos: Monomate, 12.5%
Speard: Ceramic Knife, 6.25%*
Tech User: Wood Cane, 6.25%*
Shadow Saber: Shadow Blade, 6.25%
Slave: Repair Kit, 12.5%
Float Mine: Dynamite, 6.25%
Zio's Guard: Dimate, 12.5%**
Tech Master: Force Cane, 3.125%**
Blauzen: Laser Claw, 6.25%
Greneris: Star Dew, 6.25%
Tower: Dynamite, 6.25%
Command Ball: Dynamite, 6.25%
Siren386: Plasma Dagger, 6.25%
Debugger: Repair Kit, 12.5%
Silvalt: Plasma Claw, 6.25%
Servant: Repair Kit, 12.5%
Frost Saber: Trimate, 12.5%
Chaos Sorcerer: Moon Dew, 6.25%
Radhin: Trimate, 12.5%
King Saber: Genocy Claw, 6.25%
Browren486: Repair Kit, 6.25%
Dominator: Sonic Buster, 6.25%
Shrieker: Cure Paral, 6.25%
Blood Saber: Trimate, 6.25%***
Dark Witch: Laco Rod, 3.125%***
Illusionist: Star Dew, 6.25%
Imagio Mage: Sol Dew, 6.25%****
Dark Rider: Moon Slasher, 6.25%****
Chaos Bringer: Defeat Axe, 6.25%



* When Speard and Tech User are in the same formation, Ceramic Knife will be dropped.
** When Zio's Guard and Tech Master are in the same formation, Dimate will be dropped.
*** When Blood Saber and Dark Witch are in the same formation, Trimate will be dropped.
**** When Imagio Mage and Dark Rider are in the same formation, Sol Dew will be dropped.

[Zucca]

Flatter Plant: Antidote, 1/5

That would result in item drop "value" of 25.6. Seems odd?
Did you meant 1/4? That would give value of 32.

[etony33]

Awesome! Thank you so much.

[lorenzo]

Flatter Plant: Antidote, 1/5

That would result in item drop "value" of 25.6. Seems odd?
Did you meant 1/4? That would give value of 32.

1/5 was an approximation....the drop rate is 24/128, which would become 3/16 but it reads odd to me, but I'm not sure. I'll edit the first post to use percentages. it'll probably be clearer

[Zucca]

the drop rate is 24/128, which would become 3/16 but it reads odd to me

3/16 == 1/(5+1/3) == 18.75% ... I guess.

I'll edit the first post to use percentages. it'll probably be clearer

Yeah. Percentages could be the best way to represent the values.

[etony33]

Hmmm. I just thought of something.

Can the quasi boss Chaos Sorcerer also drop a Moon Dew? I know that some enemies (Fract Ooze comes to mind) have two entirely different forms (with the Fract Ooze under Monsen being immune to ID attacks and having more HP), but I don't think that is the case with the Chaos Sorcerer. I can confirm that the saboteur Chaos Sorcerer is vulnerable to Holyword and Diem.

[lorenzo]

Nope, that Chaos Sorcerer does not drop a Moon Dew.

[etony33]

The data for the battle formations themselves (and the areas they can appear, as well as the rate at which they appear in a specific area) is not easily accessible, correct?

[Zucca]

The data for the battle formations themselves (and the areas they can appear, as well as the rate at which they appear in a specific area) is not easily accessible, correct?

That data is compressed.

I saw source code for the compressor somewhere... I'm not sure if it could also decompress.