Q:
Stacking shadow refuge
A:
Since that latest patch you can only get a limited amount of stealth so for permanent stealth each of the Thieves has to cast Shadow Refuge every few seconds.
Hi all. There was a change implemented that seems to have not made it into the patch notes from Monday that was intended to go in the ‘Professions’ section. Stealth now only stacks up to five times consecutively, meaning you can’t bombard yourself with massive stealth applications to become invisible for extended periods of time.
We’ll be including the patch note in a future update. Good catch!
https://forum-en.gw2archive.eu/forum/professions/thief/The-Undocumented-Nerf/first#post540643
What DesertRose said. You could always stealth the group, run for 10 seconds and then another Thief applies the Shadow Refuge.