*Disclaimer* This info isn't necessary to read, but you may understand the game's lingo a bit better. Not all of the info will be revealed, just some basic stuff.
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Difficulty Levels:
(low to high)
Earth
Venus
Mercury
Valhalla
Niflheim
Ragnarok
Rarities:
(low to high)
Common
Uncommon
Rare
(^Are mainly found in places below level 20, the rest below are all found in places above that apart from Rare)
Bronze
Iron
Silver
Platinum
Gold
Epic
Master
Quasi-Legendary
Legendary
Divine
Special Categories:
Unorthodox: A powerful category of weapons. Most growth weapons are powerful in their base form, reaching about platinum levels of usefulness, but they are normally stuck at a low level unless upgraded.
After passing lv.10 after level ups, their rarity starts to increase, peaking at Master levels of power before lv.150.
They are untradeable once someone has bounded to them. There are also only ten Unorthodox per weapon category in the game, with Unorthodox skills being even more rare (armor can not be Unorthodox).
Relic: A specialized version of Legendary gear. These pieces are normally more powerful in specific areas, but completely useless in others.
Undroppable.
Quest: Keys, fuels, or anything needed to open or complete quests/dungeons/secrets.
Types:
Weapon:
Swords:
Sword
Shortsword
Longsword
Greatsword
Heavy Greatsword
Axes:
One Handed Axe
War Axe
Great War Axe
Heavy Great War Axe
Hammers:
One Handed Hammer
War Hammer
Great War Hammer
Heavy Great War Hammer
Spears:
Spear
Light Spear
Long Spear
Halberd
Shields:
Shield
Light Shield
Greatshield
Heavy Greatshield
Knives:
Knife
Dagger
Bows:
Bow
Short Bow
Longbow
Crossbow
Casting Tools:
Staff
Wand
Arcane Book
Unique:
Unique
Equipment:
Helmet: 1
Mask: 1 (2 depending on the type)
Neck: 1
Breast: 1
Cloak: 1
Arms: 2 (most come as a set)
Gloves: 2 (most come as a set)
Leggings: 1
Boots: 2 (most come as a set)
Accessory: Vary
These range from necklaces to earrings
Pet: Vary
Unique: Vary
Skills:
Rankings: Rankings (aka Rank) can be changed on skills if put through specific conditions.
<★> = Rank 1
(akin to a (worst) Common (best) Rare)
<★★> = Rank 2
(akin to a (worst) Bronze (best) Silver)
<★★★> = Rank 3
(akin to a (worst) Topaz (best) Gold)
<★★★★> = Rank 4
(akin to a (worst) Epic (best) Master)
<★★★★★> = Rank 5
(akin to a (worst) Quasi-Legendary (best) Legendary)
<★★★★★★> = Rank 6
(akin to a Divine)
Status Effects:
(More will be added)
Bleed: 10% of the original damage as a tick
Can be upgraded.
Poison: Different poisons exist; mainly ones that damage, paralyze or slow, blind, etc.
^More will be revealed/added in either more lists or at the bottom of chapters.
Monster Rankings:
(low to high)
Normal
Elite
Warrior
Chief
Lord
Master
General
Mystical
Ancient
Special Categories:
Mutant: Mutants are highly intelligent beasts that start out weak (compared to their peak), but grow quickly until they are of cataclysmic scale and danger. They drop some of the best loot in the game.
Rare: Added before the rank to increase skills and drops.
Types:
(low to high)
Thrall
Acolite
Enhanced
Mini Boss
Boss
Monarch
Special:
Evolved (Insert Type): These are specialized enemies that have better drop chances for loot. Many Mutants and Master+ enemies are Evolved.
If you need, comment on stuff with a [+] at the end and I'll provide a bigger description of them.