Who the hell designed this magic potion?!!

I have a couple questions: 

1: does the creature opening the bottle decide who the lightning attacks, or is it random, if it is the latter, how would the random person be selected.

2: 1d100?!! What the actual HELL?!! 5 of these bottles could destroy an ANCIENT GOLD DRAGON if they got in max dmg. The Ancient Gold dragons has one of if not the highest amount of health in the Monster Manual, and is a challenge rating 24! 1d100 damage can one shot at least 75% of creatures in the monster manual if it rolls 100. Idk if you were new to dnd when you made this, but the Ancient Gold Dragon, one of if not the strongest creature in the monster manual, has around 450-550 health. Maybe you've been playing to many video games where the bosses and players have hundreds of health, but in D&D, an average 1st level player has around 5-15 health. And most monsters don't reach over 100 health, a Beholder, has about 170 health, and if you got 2 crits (roll 100 with the lightning) the beholder is just dead. Now I have a private homebrew brew that essentially a nuke, dealing 20d20 poison, acid, and fire dmg to anything within 100-1000 ft, that ***** slaps most the ANCIENT DRAGONS, but It is meant to be stupidly broken, as there's like 2 of them in my campaign, and one was already used to practically wipe out a civilization by a group of bad guys. This just seems like you intend it to be loot that the party could randomly find in a dungeon.

It's a strange damage die to be sure, but you do realise that the odds of rolling max damage on 5 of these is 1 in 10 billion? I don't think ancient dragons have much to worry about.