This mod was created for fun, diversity and entertainment. After completing the game for a few times I wondered: what if I won't be limited by CDProjekt RED and that's how I decided to make a unique, modded adventure. 
For now this mod only affects original game (no impact on NG+). 

A list of changes: 
- grandmaster sets require 1 piece to be activated 
- I love cat, bear and viper sets, that's why their parameters were increased in some way (read further) 
- no silly grandmaster cat hood 
- added the Redwolf toxic and critical damage abilities to cat, bear and viper sets (yeah, took the best from it:) 
- NO changes to the original attack and defence/resistance parameters 
- so the 3 sets of cat, bear and viper have the bear set bonus in the chest, gryphon in gloves, redwolf in pants and puss in boots:) 
Swords have tesham mutna bonus of 10% (20% in total, which is still about 120HP i don't know why, tested it for a several times), bonus 50% gold from corpses and increased durability. 
- cat and bear sets have grandmaster's abilities from the beginning, no need to wait for the Tussaint and the end of the game. 
- about grandmaster bonuses: Chance to reapply quen is now 50% instead of 30%, the bonus number of elixirs was increased from 1 to 6, no adrenaline spent on the cat's attack from behind, energy recovery was slightly increased inside irden's field. 
- irden slows down the enemies slightly stronger 
- axii mind control lasts a little longer 
- power of the mending glyph was increased on 10 times (it resrores 10, 20 and 30 HP depending on the glyph size) 
- Quen. I was irritated that it lasted for like 20 seconds. Now it lasts significantly longer. NO changes to the shield power! 
- maybe something else, I don't remember:) 

!How to install: 
Put modGrandBearCatViper in the Witcher 3 'mods' folder, put content in the game folder or manually replace gameparams.ws with my file. 

Interesred? Download and rate the mod. This is my first attempt, first experience. Made and tested with last version of the game (1.32) 

Happy New year!:) 

Superolegon - author of "GrandBearCatViper1" mod.