I completely agree on this.
Mutagens had a TON of potential to be interesting and game changing. Why have +x% sign intensity ? +x% attack power ?
It's a shame CDPR missed out on that. I'd have loved to see stuff like:
1. Rotfiend Mutagen, Green - "On bomb throw, there's an x% of a second explosion for 50% original damage"
2. [ Depending on which monster dropped, change the name + additional effect, blue] "When your Quen shield drops off / explodes, there's a chance to freeze / burn / poison / foes in the area"
3. Arbalist Mutagen, Red - "Crossbow shots against enemies that are already bleeding, do +x times damage"
4. Wraith Mutagen, Blue - "When casting Aard on an enemy inside Yrden, cause blindness for x seconds"
5. Bear Mutagen, Red - "Strong attacks against blocking opponents have a chance to knock back the enemy and break their guard"
I could go on like this for hours, but I don't want to spam too much.
Basically, I'd be happy to have mutagen affect abilities tied to their tree, instead of a flat % increase in a passive stat. Something that could really add a ton of flavor to your abilities and playstyle.
Regarding trophies: I'm not sure how I feel about them, but currently they provide no flavor to the gameplay, same as current mutagens. Maybe have them increase a specific part of fighting, like all bleeds cause double damage [Wyvern ?], or poison [Basilisk]. Enemies burn for twice as long [Fiend ?].
EDIT: Man I wish I knew how to mod stuff like that
---------- Updated at 02:17 PM ----------
Making another post just with ideas, cause you guys gave me a creativity burst and I need an outlet
Mutagens
Blue
Bear - Aard now causes foes to be knocked back for twice the distance
Noonwraith - Enemies inside Yrden recieve additional damage from sword attacks as fire with a chance of burning
Nightwraith - Adds a small leech life effect to your swords when attacking enemies inside Yrden
Ghoul - Igni has a chance to cause enemies to bleed
Add monster name here - Casting Axii on an enemy with low health causes him to commit suicide
Name - After Axii wears off, the enemy will hit and move x% slower
Name - Increases Yrden size by x% and adds a chance upon entering to become frozen
Red
Nekker - Attacking bleeding enemies has a chance to cause double damage on each sword strike
Wolf - Consecutive hits on the same enemy place a stacking bleed
Endrega - Poisoned enemies have a chance to become stunned from the poison
Nekker warrior - Strong attacks cause gashing wounds, causing the target to bleed over enemies, causing a small area damage every second
Ghoul - Fast attacks have a chance to become a small whirl and hit every enemy in 8 yards
Green
Fiend - Each potion effect also increases armor by x%
Waterhag - Bombs cause a stun in addition to their current effects
Gravehag - Bombs cause poison in addition to their current effects
Leshen - For each potion active, your sword attacks hit an additional foe
Name - When toxicity is above 50%, sword attacks increase potion duration slightly
Name - Consuming a decoction also gives the Swallow potion effect at no toxicity cost
Name - When the last charge of an oil is consumed, increase damage against same monster type by x% for x seconds
Bleh, I'll stop here, going back to play and get more ideas :e