Well, I'm a Brazilian minecraft player and I'm using a translator to write here, so sorry for spelling errors or bad conjugation of verbs. I had some ideas of incantations and curses for the items in the game.
Lightness: This spell only works on spades, tridents, and tools in general, leaving them with their attack speed faster and harder to achieve.
Level 1: The enchanted item gains an additional 0.5 attack speed.
Level 2: The enchanted item gains 1 additional attack speed.
Level 3: Enchanted Item will gain 1.5 additional attack speed.
Chemistry: This enchantment only works in Arcs and is very difficult to find, but when the weapon is used it can apply some effect to the target being: Poison, Slowness or Weakness (the order of the effects is random and both are level 1 and has the duration of the pocketable potion of the same level).
Level 1: The bow owner has a 25% chance to apply an effect on the hit target.
Level 2: The bow possesser has a 50% chance to apply an effect to the hit target.
Level 3: The possessor of the bow has a 75% chance of applying an effect on the target hit.
Level 4: The bow owner has a 100% chance to apply an effect to the hit target.
Bent Weight: This curse is only applicable for armor and leaves them heavily on the character, reducing their movement speed by 25% and the effect builds up for each armor piece with the effect.
Fragility: This curse is applicable to all types of tool and armor, leaving its durability to 1, making it break the next time it fulfills its function.
Self-Destruction: This curse is applicable to all types of tools and armor, creating an explosion equivalent to an explosive and has an 80% chance of being activated when the tool or cursed armor is used.[/pre]
I don't know Portuguese, translations are mechanical.
Are the "charms" intended to be "enchantments" [Encantamentos] such as one can get from an enchanting table or enchanted book?
In "attack speed faster and harder to achieve." what is meant by "harder to achieve."?
If the idea is 'quicker and easier to use' [mais rápido e mais fácil de usar], "handiness" would be a more accurate English term [Only 'praticidade' is offered as a translation which translates to English as 'practicality', which has a different meaning than 'handiness'.]
Given this enchanment would only apply to tools, is "attack speed" correct? [I don't see much utility to being able to use a spade or hoe faster.]
Chemistry [químico??? This name does not seem to make sense in translation.]:
"Arcs" should be bows [arcos para tiro]
"pocketable potion" seems like it should be 'splash potion'
Even if "very difficult to find" means this is a 'treasure enchantment' (like Mending), the enchantment would give a very large number of tipped arrow equivalents.
At minimum, "Chemistry" ought to be mutually exclusive with both Infinity and Mending.
My understanding from reading the description is that one of three effects (Poison, Slowness, Weakness) is randomly selected with each arrow shot.
Is this what is intended?
Lowering the likelyhood of the arrow imposing the effect to 20% per level (ie Level 4 = 80%) might help balance the item.
Bent Weight ['Excessive weight' (peso excessivo) might work better as an English name.]
At a 25% movement speed reduction per piece, four pieces would leave a character immobile. This seems excessive.
25% (1/4) for the first piece, but half that (12.5% = 1/8) for each additional piece would have a maximum reduction of 62.5% (5/8) (Or 75% (6/8) if this curse can also affect shields.)
Fragility: Setting the durability to 1 is too great an effect. Doubling (or tripling) the rate at which the cursed item loses durabilty would still leave such an item minimally usable.
Self-Destruction: I don't see a use for this. (Possibly in map-making/adventure maps.)
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WARNING: I have an extemely "grindy" playstyle; YMMV — if this doesn't seem fun to you, mine what you can from it & bin the rest.