(adsbygoogle = window.adsbygoogle || []).push({}); I'm going to make this short guide for people to explain Modding Skill Trees. It's relatively simple although there are some issues that you may run into. First off I'd like to point out that it has nothing to do with adding Skill Points. The game has a sanity check on how many Skill Points you should have regardless of what you put in Gibbed, so you can not do it that way.​

First you need to open your save up in Gibbed and go over to the Raw tab and scroll down to SkillData.

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Click the down arrow on the right to open a new window.​
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What you'll now see is list of SkillData values in the window on the left side. These correspond with each skill on your Skill Tree . When you click on one you will see the actual skill in the window on the right and a Grade value. The first value in the SkillData list is your actual Action Skill itself, so this Grade will always be 1.​

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Change the Grade to the appropriate value.​
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If you are unsure of the Grade value for a particular skill, you can just set them all to 5 . It will not allow you to set a value higher than what is possible in game.