For Stone Vigil:
1) DO NOT fight at a place where the dragon can swoop down and douse you all in fire... If there is an opening in the roof, let tank edge forward first and see if it swoops down...
Pull enemies to a safe place to fight them...

2) Aevis can't be slept as others said already, so whenever possible, try to get them first without pulling other enemies at the same time.

3) Be careful in the later part of the dungeon as ice sprites will spawn out of nowhere, and some Aevis roam around that place.
Always let tank go first to check what enemies are around, and wait a few to see if any Aevis is roaming.

4) Before every fight, try to put stoneskin on yourself and the dps.
Do not cast regen until tank is engaged.

5) DO NOT try to speed through the vigil...