Add one ability to another class...
 

If you could take one class and add an ability...what’s the most OP?

Feign death on enchanter?

Let’s hear them!

Maybe you should clarify exactly what you mean by "ability". FD is a skill or spell effect.

Let’s do both spell or ability.

Magicians should take Rune from Enchanters, and then Wizards should get CotH. Those spells make more sense on those classes

Shaman with enchanter charm line.

Bard gets memblur,
Cleric gets mez
Monk gets Selos (with instrument mod)
Warrior gets CH
Shaman gets clarity
Rogue gets fear, or if grouping, coth
Druid gets torp
Wizard gets mage pet.
I haven't played a pet class, but I bet they would enjoy a pure to finish off mobs.

I would give Warrior flame lick or snare.

Probably .. I haven't played one.

Complete heal on an enchanter.

If op’s question is what would be the most overpowered change, I’d guess giving enchanters CH is a viable suggestion