If I killed a Linnea Warsong as the last action of the turn, would my opponents first wound on the next turn be negated? Or would it disappear as the turn ends?

Do abilities that done say "until the end of the turn" etc. end or not??

the wound reduction is permanent (lasting through turns) until it is used up.

Thank you, thats all I needed to go. So that character is even more annoying than I thought haha

Didn't the rules get reworded recently to say things like this were only till EoT unless it specifically says otherwise?

Yes they did.

Glossary - Add the following after the last sentence of On-Going Effect,
“If a duration is not specified, the effect lasts until end of turn.”
so that the entry reads,
On-Going Effect: A ‘continuing’ card effect that is generated by an action. The duration of an on-going effect is set when the action is performed. It may last as little as the duration of another action, or as long as the rest of the game. If a duration is not specified, the effect lasts until end of turn.

So this changes how this char now operates.

not in this case she still has a duration the next wound suffered

Thanks!