Here is a list of unique weapons and armor that do not appear as fixed drops (i.e. Buaku's Blade, Koga Shuriken), their basic stats, and enemies I've obtained them from. Due to random enemy mob generation, it is unlikely that all can be obtained in a single playthrogh, though all of the strongest weapons and both maximum body armor pieces can be gotten easily with the save/reload trick.

For armor I've listed stats that always appear, though additional bonuses may also be present. I have not listed the bonuses for weapons, though there will typically be one property that will always appear; the Assassin's blade will always do poison damage, the Imperial harpoon will always have a charisma bonus.

There are several tiers of difficulty and power for enemies encountered in the wild, which I will refer to as low, mid and high. Low tier are encountred in the first explorable area. Mid level roam the second and third. High level enemies will be found in the final wilderness, but more specifically the mountain, the mountain caves, and Meifumado fortress.

One-Handed Swords

Assassin's Blade Minimum Level 1 Strength 50 Dexterity 80 Base damage 10-15
Dropped by Low-Mid Tengu

Blood Drinker Minimum Level 1 Strength 50 Dexterity 80 Base Damage 10-15
Dropped by Low-Mid Tengu

Shikome's Banisher Minimum Level 1 Strength 55 Dexterity 80 Base Damage 15-25
Dropped by Mid Level Tengu

Echigo Kodachi Minimum Level 12 Strength 60 Dexterity 80 Base Damage 11-26
Dropped by Mid-High Tengu

Tamiya Batto Minimum Level 15 Strength 70 Dexterity 90 Base Damage 13-31
Dropped by Mid-High Tengu

2-Handed Swords

Hidari-no Minimum Level 15 Strength 90 Dexterity 120 Base Damage 14-46
Dropped by High Giant Oni Boss, High Ghost Armor Boss
Test of the Hojo Clan Bosses Ichi-no/Go-no

Migni-no Minimum Level 20 Strength 80 Dexterity 110 Base Damage 17-53
Dropped by High Tengu Boss, High Death Maiden Boss
Test of the Hojo Clan Boss Go-no

Tsubame Minimum Level 25 Strength 100 Dexterity 125 Base Damage 24-67
Dropped by High Giant Oni Boss, Test of the Hojo Clan Boss Go-no

Hwa-Rang Chil-ji-do Minimum Level 30 Strength 120 Dexterity 220 Base Damage 100-175
Dropped by High Death Maiden Boss, High Giant Oni Boss
Test of the Hojo Clan Bosses Ichi-no/Go-no

Polearms

Kitsune-bi Minimum Level 1 Strength 50 Dexterity 50 Base Damage 5-15
Dropped by Low Mad Priest

Spirit Spear Minimum Level 1 Strength 60 Dexterity 55 Base Damage 7-15
Dropped by Low Wolf Clan Boss

Tidal Spear Minimum Level 1 Strength 80 Dexterity 55 Base Damage 10-20
Dropped by Mid Mad Priest

Winged Yari Minimum Level 15 Strength 135 Dexterity 85 Base Damage 37-59
Dropped by Mid-High Mad Priest

Ro-Zoku Yari Minimum Level 15 Strength 200 Dexterity 70 Base Damage 30-45
Dropped by Test of the Hojo Clan Boss Shi-no, High Wolf Clan Boss

Butcher's Spear Minimum Level 25 Strength 150 Dexterity 110 Base Damage 51-72
Dropped by High Giant Oni Boss, Test of the Hojo Clan Boss Ichi-no

Imperial Harpoon Minimum Level 25 Strength 165 Dexterity 129 Base Damage 55-83
Dropped by High Giant Oni Boss, Test of the Hojo Clan Boss Ichi-no

Bows and Thrown Weapons

Aizu Minimum Level 10 Strength 45 Dexterity 130 Base Damage 13-34
Dropped by Mid Level Tengu

Kamui Minimum level 15 Strength 45 Dexterity 125 Base Damage 15-25
Dropped by Mid Tengu, Mid Death Maiden

Saru-tobi Minimum Level 15 Strength 65 Dexterity 150 Base Damage 25-30
Dropped by High Death Maiden Boss, Test of the Hojo Clan Boss Ni-no

Ryushi Minimum Level 20 Strength 65 Dexterity 180 Base Damage 25-64
Dropped by High Tengu Boss, High Death Maiden Boss
Test of the Hojo Clan Boss Ni-no

Body Armor

Hiromi Minimum Level 1 Strength 60 AC 100 Damage Reflection, Strength+, Dexterity+
Dropped by Mid Level Tengu

Kobara Minimum Level 15 Strength 60 AC 200 HP+
Dropped by High Giant Oni Boss, High Death Maiden Boss
Test of the Hojo Clan Bosses Ichi-no/Go-no

Yuzan Minimum Level 20 Strength 170 AC 145-155 Resist all Elements, HP+
Dropped by High Giant Oni Boss, High Death Maiden Boss
Test of the Hojo Clan Bosses Ichi-no/Go-no

Head Armor

Saika-bachi Minimum Level 1 Strength 30 AC 40 Damage Reflection, Resist all Elements, Ki+
Dropped by Low-Mid Tengu

Sakura-bachi Minimum Level 10 Strength 60 AC 50 Dexterity+, HP+
Dropped by Mid-High Tengu, Mid-High Death Maiden

Onizuka Minimum Level 10 Strength 120 AC 60 Lightning Resist, Vitality+
Dropped by Mid-High Tengu

Arm Armor

Bakudan Minimum Level 10 Strength 30 AC 20 Charisma+, Ki Level+
Dropped by Mid-High Tengu

Jibaku Minimum Level 10 Strength 50 Ac 30 Water Resist, Ki+
Dropped by Mid-High Level Tengu,/Death Maiden,/Ghost Armor

Karashi Minimum Level 15 Strength 90 AC 40-45 Damage Reflection, Dexterity+
Dropped by High Death Maiden, High Tengu

Leg Armor

Suika Minimum Level 10 Strength 30 AC 22 Dexterity+, HP+
Dropped by Mid Tengu, Mid Mad Priest

Kabocha Minimum Level 10 Strength 50 AC 30 Lightning Resist, Strength+
Dropped by Mid Tengu

Ka-Eru Minimum Level 10 Strength 90 AC 40 Charisma+
Dropped by Mid-High Level Tengu

I've been playing ToD for years and I've been looking for more combos than just the one listed in the Prima Strategy Guide (1 combo for each element, plus the Kappa Combo) plus the Buddha armor combo.

Recently I found an Wayback snapshot of a fan page that shows there might have been several other combos, but the icons are all deprecated and thus I can't tell what they might have been.

It gives 8 combos, #'s 1-4 for weapons and #'s 5-8 for armor. The combos are:

#1 (Fire) +1 level to all Fire spells. This is Coral, Kappa Blood, Yama-Inu Blood, and is in the Prima guide.

#2 (Water) +1 level to all Water spells. This is Pearl, Kappa Claw, and Oni Fang, and is in the Prima guide.

#3 (Earth) This one has some great bonuses: +20 weapon damage, 1-10 of all elemental damages, and +1-3 poison damage. It has four pieces, that total 8 slots. I am at a loss for what this might be.

#4 (Fire) This one also has some great bonuses: +50 weapon damage, 10% freeze chance, and 10-20 of all elemental damages. It also has four pieces, that total 7 slots. One of the items is a Hairpin I know, but I don't know the others. I imagine one is the Magma Sphere, which will make it impossible to get in a solo game.

#5 (Lightning) +1 level to all Lightning Spells. This is Cho-gokin Ore, Tengu Feathers, and Spider Witch Cobwebs, and is in the Prima guide.

#6 (Earth) This one has some excellent bonuses: AC +25, Durability +25, and +50% to all resistances. It has four pieces and totals 14 slots.

#7 (Lightning) This one also has good bonuses: AC +35, Durability +15, and +50 health points. It has four parts and totals 9 slots

#8 (Water) This is the so-called "Buddha Combo": +50 Ki, Ki Leech of 20%, and +90 to all resistances. It has four parts, the four 'Buddha parts' from the evil wizard at the front of each Daimyo's castle. It takes 4 slots total.

There is another combo, the 'Kappa Combo' listed in the Prima Guide. It's a Water combo and gives +25% knockback chance and +25% freeze chance. It consists of Kappa Blood, Kappa Claw, and Elder Kappa Shell which doesn't seem to make any sense as Kappa Shell is armor-only and Kappa Claw is weapon-only.

If anyone has any insights into this mystery, please post with your thoughts. Happy hunting.

Here are three of the combos:

4, hairpin magma sphere hemp forest oni horn

6, elder kappa shell guardian dragon skin yama inu pelt

7, ghost armor plates gaki bones oni bones