Hey guys, with DISE (Dead Island Save Editor) you can mod your individual skills, but you can only mod them to 14-16 if you aren't Premium. This tutorial will show you how to bypass Premium :D
DISE 0.1.3.6 or Higher
1. Open your Save in Horizon and click the Contents tab.
2. Extract the file that's there
3. Open the Extract file into DISE
4. Go to the Skills tab
5. Set the Skills you want modded to "5"
6. Open Cheat Engine and click the icon under "File"
7. Select "dise.exe"
8. Search for "5" as 4 Bytes
9. Go back to DISE and change the Skills that are "5" to "10"
10. In Cheat Engine do another search for 10 this time (Next Scan)
11. You should find your Skills, change those to anything between 0-5000.
12. Go back into DISE and press the Tweaks tab and then go back to the Trees tab.
13. You should see that your Skills are maxed to what you changed them to in Cheat Engine.
14. Save your file in DISE and replace the file back into your Save with Horizon
15. Rehash/Resign the Save
NOTE: DO NOT SET THE SKILLS TOO HIGH, OR ELSE YOUR SAVE WILL BE MESSED UP!!! 32767 IS THE HIGHEST THE GAME WILL READ, BUT DON'T GO HIGHER THEN 5000!!!