Amiibo drops

Drop tables

Idx	Name	Description
0	Normal
1	Normal2	Unused.
2	SmallHit
3	SmallHit2	Unused.
4	BigHit
5	BigHit2	Unused.
6	GreatHit
7	GreatHit2	Unused.

amiibo registering

amiibo are registered every time an amiibo is used.

• AIDef:Action/CreateEpona does so after Epona has been spawned.
• AIDef:AI/WolfLinkAmiibo does it after spawning Wolf Link.
• AIDef:Action/ItemAmiiboSelectDropTable registers an amiibo as soon as it is scanned, even before spawning the drops.

Whenever an amiibo is registered:

• AmiiboMgr determines if it should reset its daily amiibo use history (stored in the AmiiboTouchHistory flag).
  • If less than 86400 seconds (1 day) have elapsed since the game was launched, don't do anything.^[check]
  • AmiiboMgr then computes 10000 * now.year + 100 * now.month + now.day. If the value is different from AmiiboLastTouchDate (which would mean that a day has elapsed), the AmiiboTouchHistory array is cleared.
• An entry for the scanned amiibo is inserted into AmiiboTouchHistory. Only the last 100 entries are kept.
• For a first time scan, a new entry is inserted into AmiiboTouchHistoryTotal (only the last 200 entries are kept). Otherwise, the scan count is incremented by updating the existing entry.
• Finally, AmiiboLastTouchDate is set to the current date.

The format for AmiiboTouchHistory and AmiiboTouchHistoryTotal entries is "%s_%d_%d_%d" (amiibo UID, amiibo value 1, amiibo value 2, scan count) 

Logic

A SmallHit happens 20% of the time.

If the amiibo has been scanned 0, 1, 2, 3 or 4 times, you'll get a GreatHit 20% of the time. If you didn't get a GreatHit, the game will ensure you get a BigHit.

If the amiibo has been scanned 5 times or more, you'll always get a GreatHit. In this case, the BigHit table is ignored.

For BigHits and GreatHits, the game uses the 'Remain' tables if Find_4Relic_1stClear is set, 'Parasail' if IsGet_PlayerStole2, and 'Normal' otherwise.

The game then determines the number of drops from each table:

• For a GreatHit:
  • GreatHit drops: random number between RepeatNumMin and RepeatNumMax for GreatHit
  • SmallHit drops: same, but for SmallHit (if there is a SmallHit).
  • Normal drops: random number between RepeatNumMin and RepeatNumMax for Normal, minus the GreatHit drop num
• For a BigHit:
  • BigHit drops: random number between RepeatNumMin and RepeatNumMax for BigHit
  • SmallHit drops: same, but for SmallHit (if there is a SmallHit).
  • Normal drops: random number between RepeatNumMin and RepeatNumMax for the Normal table, minus the BigHit drop num

After a GreatHit, the amiibo's scan count for the amiibo is reset to 0 (0x710064AC8C).

Special cases

Items with the AmiiboArmorItem tag

???

Items with a name that starts with GameRomHorse

If it is the first time you are scanning an amiibo that can drop horse equipment (if IsAmiiboDrop_GameRomHorseItem isn't set), the game will always spawn GameRomHorseSaddle_01 and GameRomHorseReins_01.

If you have already received those items, they will not spawn consistently anymore (or not at all^[check]).

Ancient arrows

Obj_AncientArrow_A_01 and Obj_AncientArrow_C_01 can only spawn if you have already received Ancient Arrows at some point (if IsGet_AncientArrow is set).

Items with the Important tag

The IsGet_ flag for Important items must be false; otherwise they will not spawn.

Drops from Item_Amiibo_DropTable_012, Item_Amiibo_DropTable_013, Item_Amiibo_DropTable_015

???

Ore, electric/bomb arrows, GreatHit items

These are always spawned as a chest item (TBox_Field_Iron). The chest always receives the "IsAmiibo" property and "SharpWeaponJudgeType" is set to 2, which causes different weapon bonuses and guarantees the weapon will have at least a blue/white modifier.

Divine Beast helms (Armor_181_Head, Armor_182_Head, Armor_183_Head, Armor_184_Head)

When scanning a Champion amiibo, if you've completed any Divine Beast and received a Great Hit, and if you haven't already received the corresponding helm, the chest is guaranteed to contain the Divine Helm.