Each set of Grandmaster gear in the Witcher armour schools gives Geralt a bonus for using multiple pieces at once. These are important to know since they may sway your decision about which gear to craft.
So here’s a run-down of the Witcher Gear bonuses:
Grandmaster Feline gear gives these bonuses:
3 pieces: Strong Attack increase Fast Attack damage for 5 seconds by 10% for each piece of the set.
6 pieces: Rear attacks deal 50% more damage, and also stun the opponent at the cost of 1 Adrenaline Point(s).
Grandmaster Wolven gear gives these bonuses:
3 pieces: Up to three different oils can be applied to a sword at a time.
6 pieces: Bombs are thrown without any delay.
Grandmaster Ursine gear gives these bonuses:
3 pieces: When a Quen shield shatters, there is a chance a new one will be cast at no Stamina cost. The bonus increases by 5% for each piece of the set.
6 pieces: Damage dealt by abilities linked to the Quen Sign is increased by 200%.
Grandmaster Griffin gear gives these bonuses:
3 pieces: After using Stamina to cast a Sign in its standard mode, the next Sign cast within 3 seconds will be cast in standard mode without using Stamina.
6 pieces: The size of Yrden traps is increased by 40%. While you are within an Yrden trap, Stamina regeneration is increased by 5/s and Sign Intensity by 100%, and damage is reduced by 20%.
Grandmaster Manticore gear gives these bonuses:
3 pieces: Critical hit chance and critical hit damage also apply to bombs.
6 pieces: The max. number of charges for each alchemy item is increased by 1.
The same also apply to the Grandmaster Legendary versions in New Game Plus.
The Witcher 3 Guide 
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