I am sure this has already been brought to your attention. But quite often while the alliance has control of wintersgrasp the portal dissapears and only reappears when the next patch has started.

This is annoying for Vaults of Archavon, since if the player is not in wintersgrasp and the portal dissapears they have to either ride there, get warlock summoned, or use the afk exploitation from the BG's in wintersgrasp.

Either make it so the portal remains there 100% of the time while a faction controls it. Or add a summoning stone that can only be used while a battle is not in progress.

This is a known issue. Thanks.

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Maaven
Blizzard QA