Guild Wars 2

I died from my HP pool depleting as I was jumping into the present at the end so I never made it to the chest and missed out on the items within but I did get the achievement.

I’m pretty sure the items reset at midnight UTC.

Basically, the first time you should get a karma flask, a random booster or snowman tonic, and some presents. After that, just the presents.

if you die on your first attempt but get the achievement, don’t worry, the items are still there. I did the same, tried it again and got my flask (this time I still had 200hp before jumping in ;-).