A few bits of confusion that I've been encountering around this topic.
First up, just to clarify (beacuse if I've been playing this wrong, it'll have a massive knock-on to everything else) are the following statements true.
- Having Strength 0 does not lead to automatic death - (otherwise why have a card with printed strength 0, it would be unplayable - i.e Hoster Tully.)
- Having Negative Strength (i.e. because of attachments) does not lead to automatic death
- Characters with 0 or negative strength can still participate in challenges - example: Aggo, with his bow attached has been made stinking drunk, giving him strength minus 1. He can still attack, alongside another character, in order to use his bow on a defender, he just takes one away from the other attacking chracter's total.
That's how I've been playing it thus far, this is where things get hazy...
If someone plays threat from the North in the above scenario, Aggo's strength is now -2. The wording of the card simply says characters are discarded "if their strength is zero" his is not zero, it is minus 2 - is he discarded? (similarly with flame-kissed, flaming pitch tower, drogon and other characters who for whatever reason were surviving happily at strength 0 or minus something, but have now been lowered even further.)

