Rules FAQ
Bringing Shadowskin Cloak out of shadows after a character has already been bypassed by stealth will not allow that character to be declared as a defender during that challenge.
The forced interrupt triggers before lasting effects that last "until the end of the phase" expire, and before delayed effects "at the end of the phase" resolve. (See End of Phase Timing Sequence.)
Rules FAQ
Triggering the reaction may cause another character to be attacking or defending alone for the purposes of triggering card abilities (for instance, Lady Sansa's Rose).
You can remove attached character from the challenge even if it is already standing, or if it cannot stand for some reason (for instance, due to Delena Florent).
Removing the only attacking or defending character will not change the challenge resolution in any way. The winner of the challenge has already been determined at that point.
The character is removed from the challenge in the D step of the D.U.C.K. sequence, which means it will no longer be participating once you get to the keywords step. Note that the assault keyword is an exception to this, since any location targeted by assault is knelt even before reactions to winning the challenge could be triggered.
Rules FAQ
A "location you own" is any location that was in your deck at the start of the game, regardless of who currently controls it.
You can only choose a location in play. You cannot choose a location in shadows or in any other out-of-play area.
If the chosen location has the Warship trait, you can still choose to return it to hand rather than placing it in shadows.
If you place the Warship location in shadows, it will not automatically gain the shadow keyword. If it does not have the printed shadow keyword, it will be stuck in shadows unless you have some other way of bringing it out again (for instance, The Queen of Thorns (TMoW)).
Rules FAQ
Blood of Valyria does not prevent effects that increase attached character's STR from expiring.
Attached character's STR cannot be set to a value lower than its base value. (See FAQ ruling on Daenerys Targaryen (R2).)
Pre-existing lasting effects that reduce attached character's STR are ignored after Blood of Valyria is attached. However, a lasting effect does not expire just because Blood of Valyria has been attached. If Blood of Valyria leaves play before the lasting effect expires, that lasting effect will immediately affect the STR calculation again.
