The skills i used are in the following screenshot:

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• Strength Training:
  Increases strong attack damage by 30%.
  
  
• Resolve:
  Reduces the loss of adrenaline points when you get hit by 100%.
  
  
• Crushing Blows:
  Increases strong attack critical hit chance by 12% and critical hit damage by 75%.
  
  
• Precise Blows:
  Increases chance of landing a fast attack critical hit by 12% and fast attack critical hit damage by 75%.
  
  
• Whirl (Very useful when fighting large groups of enemies):
  Spinning attack that strikes all foes in the surrounding area.
  
  
• Muscle Memory:
  Fast attack damage increased by 30%.
  
  
• Rend (Very useful against more giant and tanky enemies):
  Deals additional damage in proportion to the Stamina consumed. Ignores enemy Defense and increases critical hit chance by 60%.
  
  
• Razor Focus:
  Instantly gain one Adrenaline Point when entering combat.
  
  
• Crippling Strikes:
  Fast attacks now also apply a Bleeding effect.

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• Delusion:
  Target does not move towards Geralt while he is casting Axii. Increases the effectiveness of Axii in dialogues. Reduces Axii casting time.

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• Acquired Tolerance:
  Every known level 1, 2 or 3 alchemy formula increases maximum Toxicity by 0.5. Potion duration time and bomb damage +15%.
  
  
• Protective Coating:
  Adds 15% protection against attacks from the monster type the oil targets. Potion duration time and bomb damage +15%.
  
  
• Synergy:
  Increases bonus for mutagen placed in mutagen slot by 50%. Potion duration time: +15%
  
  
• Hunter Instinct (NOT REQUIRED):
  When Adrenaline Points are at their maximum, critical hit damage against the targeted enemy type is increased by 100%. Potion duration time: +15%
  
  
• Killing Spree (NOT REQUIRED):
  If Toxicity is above 0, each opponent killed increases critical hit chance by 30% for the duration of that fight. Potion duration time: +15%

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• Cat School Techniques:
  Each piece of light armor increases critical hit damage by 25% and fast attack by 5%.

We will be using the Grandmaster Ursine Armor Set (also know as the Bear Witcher Set):



When you reach NG+ you can also get the Grandmaster Legendary version of the set which is stronger obviously.

For our swords we will be using:

• Steel Sword: Grandmaster Ursine Steel Sword
  
• Silver Sword: Aerondight
  
  

For the armor we will have the Levity enhancement so we can later take advantage of the cat school technique skill since now it's basically considered as light armor instead of heavy but still has it's heavy armor perks. Specifically Levity on the armor and then Quen Intensity on the rest of the 3 gear (gloves, boots, trousers).




For the weapons we put Severance on both of the swords. The reason is so we can increase the range of our two skills Rend and Whirl.

• Tawny Owl: Faster stamina regeneration.
  
• Thunderbolt: Grants 100% critical hit chance during storms.
  
• Maribor Forest: Faster adrenaline point generation. +1 free adrenaline point when drank.
  
• Choose whatever you want for the 4th one.

• Water Hag Decoction: Damage dealt is increased when vitality is at its maximum.
  
• Katakan Decoction: Increases critical hit chance.
  
• Ekhidna Decoction: Regenerates your vitality when you do anything that consumes stamina.
  
• Ekimmara Decoction: Regenerates your vitality when you deal damage to enemies.
  
• Troll Decoction: Regenerates your vitality during and outside of combat.

• Dancing Star
  
• Devil's Pufferball
  
• Grapeshot
  
• Dimeritium

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Everytime you apply a critical effect to an enemy it gives you a random decoction from your inventory. Critical effects are freeze, burn, poison. A critical effect can also mean spamming Axi while riding Roach before you get into battle or directly onto enemies. There is a huge downside to this as you can't have more than 5 in your inventory since the ability chooses randomly up to 5 of them. So pick your most used ones and keep them on you. You can also use your bombs onto the enemies so you get all 5 of them very quickly.

You can get your decoctions applied using the mutation by:

• Applying critical effects on enemies (poison, freeze, burn, Axi)
  
• Parrying enemies
  
• Using bombs on enemies