Each tome will provide you with passive bonuses, which will differ from one another.
Depending on its usefulness, the price of a codex can be several or dozen of points.
There are twenty codexes total.
Eating is overrated
Cost
Effect
Comment
3 Points
Stamina drain from lack of food is removed.
As you advance to further levels, the codex becomes less and less useful.
All unidentified items that get to your inventory are potions and scrolls.
Combat Get You Down?
5 Points
Doubles the rate of stamina regeneration
This codex can take you far.
Greater stamina regeneration means killing more enemies and surviving critical moments.
Rotten Is Just Another Word for Delicious
4 Points
Eating rotten food no longer causes throwing up.
Useful only at the beginning of the game.
Throwing up will reduce by half the bonuses that you might obtain via eating rotten food.
This codex will save you from running out of stamina when it’s needed the most.
Berzerking: Get That Party Started
Increases attack power at the cost of defense.
Another codex that will be defined by your game style.
YOU’RE IT
Attacking has a chance to stun enemies
Useful throughout the entire game.
Knockback can give you enough space to survive even a massive wave of creatures.
Remember that you could attack opponents that will give a shot to get up.
One of the most useful passive abilities, especially when you take its cost into account.
Half of the Fun of Falling is missing the Ground
Halves fall damage.
There won’t be many situations when you will find this codex especially useful.
Some larger enemies can knock you down and attack when you are defenseless.
This codex will minimize such situations, and thus increase your chance of surviving.
Gud’s Necropolis Survival Guide
Unlocks all crafting recipes.
A cheap and useful codex.
However, it is good to unlock it, especially at the beginning of the game.
Having access to all the recipes can also be a method to test new approaches on the battlefield.
Just keep in mind that most of the required components can be gathered on further levels.
40 is a Lot of Money.
What Do You Need 30 For?
7 Points
Reduces vendor prices.
One of the least useful codexes.
Use it only if you want to save as many gems as possible, and thus increase your HP.
The Burly Ogre’s Guide to Smashing Stuff
Increases knockback against enemies.
Strictly associated with two-handed weapons.
Using knockback will grant you more space and enable you to use your range weapon.

Depending on your game style, this codex can be useful.
Lower stamina cost will allow you to perform certain actions more often.
Mr. Monk’s Most Excellent Pamphlet on Avoiding Exhaustion
10 Points
Lowers stamina depletion on performing attacks.
A useful codex if you often use High attack to slay your enemies.
That’s Not So Far
Increases jump height and distance.
Keeping Your Blood in the Inside (And Other Tips)
12 Points
Regenerates health in small intervals.
A good solution for players who take their time.
Carpe Per Diem
Increase amount of gems that drop.
Not very essential to the very gameplay, but useful when starting game with a new hero.
When that happens, gaining enough gems can make us go through all the levels at a rapid pace.
The Key to a Good Defense, Is a Good Defense (Stupid)
Become immune to knockdown.
Unlocking Your Inner Power Potential
14 Points
Lowers exhaustion amount from using power attacks.
One of the most expensive codexes, but experienced players can find it very useful.
Lowering the exhaustion of power attacks will grant you greater freedom of action, after the attack.
Vampirism Is Your Friend
17 Points
Enables life-steal when attacking enemies.
The most expensive and the best codex in the entire game.
Nevertheless, it’s good to obtain this codex.
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