Keywords
WARNING!
This page is under construction. Information may be wrong or incomplete.
Common to all characters
Block
Block is a resource used by all characters as well as a number of enemies to reduce damage taken in a turn. Block is removed at the start of your turn unless you are under the effects of 
Barricade or 
Blur. The 
Calipers Relic also mitigates the end-of-turn loss of Block.
Example: Player takes 20 damage while having 8 Block so the total damage taken will be 20 - 8 or 12.
Energy
Energy is a resource used to play cards. Every character gains 3 Energy at the start of their turn. Energy can be gained through other Cards or Relics.
Every character's cards have their own symbol for Energy.
for Ironclad
for Silent
for Defect
for Watcher
for all Colorless Cards
Card Modifiers
Exhaust
Exhausting a card removes it from play for the rest of combat and places it in the Exhaust pile which can be viewed during combat. Most cards Exhaust themselves on use, however some cards can Exhaust others.
The only way to get an Exhausted card back is using the Ironclad card 
Exhume which will bring back one card and then Exhaust itself.
Ethereal
Ethereal cards are automatically Exhausted if they are in your hand at the end of your turn.
Innate
Innate is a card modifier that makes that card appear in the first hand of cards you draw during combat. This is not in addition to the default card draw at the start of a turn; an Innate card will take up one of those slots. However, if the number of Innate cards in your deck exceeds the number of cards you draw in your first hand, all the Innate cards will still be drawn, effectively functioning as free card draw.
In some cases it may be beneficial to avoid some Innate cards because they can take up the draw slots of potentially more beneficial cards.
The 
Bottled Flame, 
Bottled Lightning, and 
Bottled Tornado Relics have an effect similar to Innate but are different in a few key ways. First of all, when duplicating a bottled card, the other copy will not appear in your hand at the start of combat. Bottled cards cannot be removed from your deck but can be transformed, which will not put the new card in place of the old one. The bottle relic will still say "Start each combat with [name of previous card] in your hand" this is a visual bug and the relic will now have no effect.
Unplayable
Most Curses as well as a few Statuses are unable to be played from your hand. One of the only examples of an unplayable card that is beneficial is Tactician, which cannot be played but can be discarded in order to gain Energy.
Medical Kit and 
Blue Candle are the only relics that allow you to use Unplayble cards.
Retain
Retain is a card modifier only found on some Watcher Cards. Cards with Retain on them will not be discarded at the end of your turn and will persist until played or removed by other means such as Exhaust. Some Curses will still be discarded at the end of your turn even if Retained.
The effects of 
Runic Pyramid are similar to Retain, but not strictly speaking the same thing. As such, 
Establishment will not interact with this relic.
Character specific
Discard
While not a defined Keyword in the game, Discard is a mostly Silent exclusive mechanic. Cards can be discarded from your hand into your Discard Pile, in exchange for a buff or to simply cycle them out of your hand. Defect is the only other character with access to Discard, with the card 
Scrape.
Discarding your hand at the end of your turn does not trigger Discard mechanics.
Watcher's Scry does not trigger Discard mechanics, and only functions as deck cycling.
Sources
These are the all the sources of Discard in the game:
a) Cards
Survivor, Prepared, Acrobatics, 
Dagger Throw, Calculated Gamble, Concentrate, 
All-Out Attack, 
Unload, 
Storm of Steel, 
Tools of the Trade, Scrape.
b) Relics
c) Potions
Triggers
These are everything that triggers on Discard:
a) Cards
Tactician, Reflex, Eviscerate, Sneaky Strike
b) Relics
Tingsha, 
Tough Bandages, 
Hovering Kite
Orbs
Orbs are a mechanic used exclusively by the Defect. Orbs have a passive effect that triggers at the end of your turn. You have a base capacity of 3 Orbs.
Channel
Channeling an Orb places it in the right-most empty slot. If an Orb is Channeled when all slots are filled, the rightmost Orb will be Evoked to make room.
Evoke
Consume the right-most Orb to trigger a powerful burst effect.
Orb Types
Lightning Orbs deal 3 (8 when Evoked) damage to a random enemy. 
Electrodynamics makes Lightning Orbs hit all targets at once.
Frost Orbs give 2 (5 when Evoked) Block. (Frost Orbs have 3 different sprites depending on which slot they are in, only the center sprite is used here.)
Dark Orbs add 6 damage to its Evoked effect every turn. When Evoked, it will deal that amount of damage to the enemy with the least health.
Plasma Orbs give 1 (2 when Evoked) 
Energy. This Orb is not affected by Focus.
Focus
Focus is a buff that increases the effect of Orbs (except for Plasma). Focus can be negative.
Stance
Stances are a mechanic used only by the Watcher. There are 4 Stances (including Neutral/No Stance) each with a significant buff and sometimes a drawback.
Some cards and relics change the Watcher to other stances. Stances can be exited using the cards 
Empty Body, 
Empty Mind, or 
Empty Fist.
- Neutral/No Stance: Watcher by default starts with no stance. No bonuses or drawbacks.
- Calm: When changing Stances, 2 (3 with
Violet Lotus) Energy. - Wrath: Deal double damage and take double damage. (Draw 2 Cards
Rushdown) - Divinity: Deal triple damage. Gain 3 Energy. Exit Divinity at the start of your next turn.
Scry
Scry is a mechanic exclusive to the Watcher. and is defined as this:
Look at the top X cards of your draw pile. You may discard any of them.
Scrying allows you to see a certain amount of cards into your draw pile, allowing you to see what cards are up next and discard them ahead of time.
Cards in the Scry screen will always be shown in draw order, with the leftmost card being what you would draw next.
However it will not trigger Discard mechanics, and only functions as deck cycling. Despite the word "discard" being used in the description, Scry does not trigger any discard effects.