allow you to upgrade all the different equipments you have (except robes). This means that even your armor, glove, or hat can be upgraded.
When you use a toolkit to enhance, your item will get a random 1~3 effects and the enhancement will also give you a rank of enhancement ranging from 3 to 1 with 1 being the best.
The toolkit comes in 3 different type: Common, High Grade, and Credihne. And here is the difference:
Common: Can only be used on item that has not been previously enhanced by Metal Toolkits. Will give Rank 3~2 bonus with 1~3 Effects (However Rank 2 chance is very very very very very very slim.)
High Grade: Can only be used on item that has been previously enhanced by Metal Toolkits, will give you the same number of effect as it has before. e.g. if the equipment had 2 bonus effects, it will give you 2 when you use this kit on that equipment, no more, no less. Have a low chance in raising the Rank bonus.
Credihne: Similar to High Grade, except it may increase or lower the number of effect on the equipment. Have a small chance in raising the Rank bonus.
*Once your item is raised into a higher rank, it will never go back down again. (e.g. Rank 3-> Rank 2, all the newer bonus will be Rank 2 bonuses, however, the effects and levels of the effect may change.
**Not all bonus effect can be obtained with Rank 3, certain bonus effects will only appear if the Rank bonus is higher.
***Not all bonus have 20 levels, some bonus such as Movement Increase have a max level of 5.
So, basically, High Grade and Credihne are used to re-enhance the equipment if you don't like what you got the first time and unfortunately both are cash shop items.
Now let's talk a little bit about the effects. The effect comes in 2 type, pure increase and level enhancement.
Pure increase would be like +3% crit, +15 dex etc.
Where level enhancement is quite different. For enhancement it powers up the said skill by a particular %.
For example, a level 20 enhancement for smash at rank 1 would be 500% x 200%, which is 1000%, such that your dmg output modifier for smash is now 1000% instead of 500%.
The basic break down of the level enhancement is something like this:
Level 1 105% -> 102%
Level 2 110% -> 104%
Level 3 115% -> 106%
Level 4 120% -> 108%
Level 5 125% -> 110%
Level 6 130% -> 112%
Level 7 135% -> 114%
Level 8 140% -> 116%
Level 9 145% -> 118%
Level 10 150% -> 120%
Level 11 155% -> 122%
Level 12 160% -> 124%
Level 13 165% -> 126%
Level 14 170% -> 128%
Level 15 175% -> 130%
Level 16 180% -> 132%
Level 17 185% -> 134%
Level 18 190% -> 136%
Level 19 195% -> 138%
Level 20 200% -> 140%
Here's screenshot of Level 19 Enhancemented Arrow Revolver o_O...
Now, remember the rank for the enhancement? It is a scale of limit to the upgrade level one can receive. The scale is this:
Rank 1 Level 1~20 Enhancement -> 1~20
Rank 2 Level 1~10 Enhancement -> 1~10
Rank 3 Level 1~5 Enhancement -> 1~3
This is the balanced value after 7/28. Prior to the date, the enhancement level have been over 20, even to the 100s.
Beside the skill enhancement effects, some of the effects offers are also pretty unique, such as increase range weapon range, allow human to use Charge Skill without shields or increase Skill Training Proficiency etc...
Last thing to note though is that different equipment will give you different effects, or example, the allow human to use Charge Skill without shield effect is an enhancement effect on 2hand weapons, you won't get this effect on bows.
*Yes, the toolkit can be used on accessory, head gear, spirit weapon, fomor weapon, foot wear, armors/clothing, gloves.
*As of 8/12, a new update has introduced the Metal Tookit Recovery Kit, which function similar to the Artisan Removal Kit that will remove the Metal Toolkit bonus from an item completely. And it would seem that the recovery kit is sold in Fomor NPC Shops. (Currently also being given out in event from defeating the Giant Co... I mean Giant Rooster*)
Metal Toolkit Recovery Kit: Allows player to remove the metal toolkit upgrade complete with 100% success chance. However, cannot be used on items that have not been upgraded with the metal toolkit.
Translation: Poor man's way of getting effect they want?
