It atacked me, even before I could lockpick the chest,. So my only way out was to pick up the chest entirely, portal away and then open the chest once I got back to safety.
Hmm... maybe it was just coincidence with me that it always seemed to aggro right after I had picked up the amulet and finished the dialogue-sequence with the monk. It sure seemed triggered by that, but perhaps it's just a proximity-thing.
Clever battle plan, I 'll try it, but I'm not sure I have access to bone chill.
Like Lotus Noctus said: If you don't have the cantrip, use an arrow of Ilmater. Though you should *really* have access to Bone Chill at this stage - it can come in quite handy in Act II as it will give disadvantage to undead enemies you hit with it. There are usually scrolls of it popping up all over the place starting in late Act I or so, so you can either single-use one of those or, preferably, have Gale or another Wizard scribe the cantrip to gain "free" and permanent access to it.
