An item which, for example, can change every single rune effect on the weapon or on the armor either randomly or to exactly the rune effect you want
#Change rune effects individually
toxic oasis
idle gazelle
Hammer + solvent
That is the way
A rng reroll is in conflict with the preexistent mechanic.
To improve the system a limit to 3 effect as armour is enaugh
frosty linden
That would be too powerful, it wouldn't work, that is not how the system have been made
solar lark
rerolling the skill should be fine 🤔