Upgrade Materials

ItemEffectSource
Hardener+1 upgrade valueTreasure chests in dungeons, 3+ hour adventure bonus
HardenerX+3 upgrade valueTreasure chests in dungeons
HardenerZ+5 upgrade valueTreasure chests in dungeons
HardenerG+10 upgrade valueM1+ dungeons, Alchemist's Island 1F
HardenerXG+30 upgrade valueM1+ dungeons
HardenerZG+50 upgrade valueIllusory Royal Tomb every 50n+20 floors (20, 70, 120...)
Illusory Ore Whetstone+10 Corrosion LevelRare from elite enemies (M6+), Rainbow Slime, Royal Tomb every 300th floor, Alchemist's Island 3F

Synthesis Materials

ItemUseSource
Silver EssenceUpgrade enchantments via synthesisTreasure chests, Alchemist's Island 2F
Gold EssenceUpgrade or transfer enchantments7+ hour adventure bonus, Alchemist's Island 2F
Star EssenceRing synthesisRainbow Slime (common), Alchemist's Island 2F

Analysis Materials

ItemEffectSource
Boid Report+3 Analysis ValueTreasure chests, adventure bonus
Rosetta Stone+10 Analysis ValueRoyal Tomb every 50n+10 and 50n+30 floors (10, 30, 60, 80...)

Unique Items

ItemEffectHow to Get
White KeyGrants access to The Door to Another WorldStory progression
Appraiser's GuideAllows automatic analysisStory progression
The Lost Nation's Magnifying GlassIncreases analysis limit to 15Complete M0 Magic Castle of the End
Ancient Blacksmith's HammerIncreases enchantment limit to 30Complete M0 Magic Castle of the End
Necklace of MistUnlocks M1Complete M0 Magic Castle of the End
Core FragmentUnlocks M2-5Complete M1 Magic Castle of the End
Origin CoreUnlocks M6+Complete M2-5 Magic Castle (4 shards combine)
Message BellEnd adventures early and recall adventurerNote from Scientist Airam
Map FragmentAccess Alchemist's IslandDaily bonus chest
Swiftfoot's Feather2x exploration speedStory progression
The Black KeyFight bosses in Fallen JunkyardRoyal Tomb every 50th floor
Apple+1 Luck (20 max)Kill any level Adam in Fallen Junkyard

Proofs of Subjugation

ProofMax LvEffectSource
Bookmark of the Netherworld??+1000 HP per levelKill Necronomicon in Royal Tomb
Combat Chip100+5 BP per levelKill Teba in M1+ Magic Castle
Thousand-Hand Core100Increases enchantment level limitKill Thousand Hands in Ancient Citadel of Wisdom
Adam's Heart10+20 BP permanent boost limit per levelKill Adam in Fallen Junkyard
Panoptes' Eye10+1 max analysis per levelKill Panoptes in Fallen Junkyard
Killing Stone10+500 max corrosion per levelKill Nine-Tails in Fallen Junkyard
Magatama10Increases legendary item rateKill Yamata no Orochi in Fallen Junkyard