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The Splash Zone
Defeat the Cauldron of Carnage while suffering from Hubris after drinking "Fireproof" Punch and "Shockproof" Soda in Liberation of Undermine on Normal difficulty or higher.
The Splash Zone is a 10-point personal achievement earned by defeating the Cauldron of Carnage while under the Hubris debuff, which is obtained by drinking both 
"Fireproof" Punch and 
"Shockproof" Soda during the fight in Liberation of Undermine on Normal difficulty or higher.
Buy Both Drinks Before Entering
Before entering the Cauldron of Carnage arena, locate the two vendors nearby: Snix Longpocket sells "Fireproof" Punch and Skitto Screwjack sells "Shockproof" Soda. This is a personal achievement, so each player who wants credit must purchase their own drinks — buy at least two of each in case of death.
Drink First Potion On Pull
Once the fight begins, drink either potion immediately — the order does not matter. This applies a five-minute debuff from that drink and starts a one-minute shared cooldown before you can consume the second potion.
Drink Second Potion At ~20%
After the one-minute cooldown has expired, drink the second potion when the bosses are low on health — around 20% is recommended. Drinking both applies the Hubris debuff, and you must have Hubris active on yourself when both bosses die to receive the achievement.
Tips
The two potions share a one-minute cooldown, so drink the first one at the start of the fight and wait the full minute before drinking the second — if the bosses die before you consume both, you will not get credit.
For a visual walkthrough of the full encounter setup, see the video guide linked on this page.