If you die during Alexandrite Map, you lose your chance at Alexandrite for the day.

[lololink]

what the hell is this? there's no warning at all that I'll lose Alexandrite if I die. I've done 6-7 maps without any problem but the last one had a bunch of bombs self-destructed on me.

what a waste of time grinding for 400 tomes... at least put some warning message to warn the new players.

It's written when you try to open the chest that the map would disappear when you try to open it, meaning that if you die against the mobs, you lose the chest.