A multi-legged reptile with the power to turn other creatures to stone with its gaze. Their eggs are quite valuable to collectors and are told to have magical properties.

As you charge forward, an angry basilisk leaps out of the shadows to defend its nest. Its eyes glow a burning red. Every second you meet its gaze, your movements grow slower, your limbs stiffer. - Bogroot Demon (RPA-ADV6) 

Given enough time, the stare of a Basilisk can petrify living things where they stand;

As you struggle with the beast, a crust of stone forms over your limbs, slowing your movements and threatening to freeze you forever in place. - Bogroot Demon (RPA-ADV6)

With enough resolve and strength, however, the effect can be broken;

With incredible effort, you break free, and the beast scurries past you to find a safer home. - Bogroot Demon (RPA-ADV6)

Basilisks cover their eggs in a special fluid they secrete that protects them from outside harm. This slime can be burned off with fire to reveal a truly beautiful object;

You place the basilisk egg into the hot coals and the slimy coating around it begins to dry and flake away, revealing a lovely, light blue shell underneath.

You look closely at the baked basilisk egg. It’s now clean and smooth. It actually smells a bit sweet. - Bogroot Demon (RPA-ADV6)

Some black market merchants make it a habit to sell them at a high price for their rarity and risk of acquisition;

You’ve heard basilisk eggs can fetch a good price from the right buyer. It is slimy and smells awful, but you tuck it into your bag. - Bogroot Demon (RPA-ADV6)

Basilisk eggs can even be a tasty snack, though some tastes call for different preparations;

Mugbok nods as you show her your starfish and your baked basilisk egg. “Very nice,” she says. “They would make a fine breakfast, I’m sure.”

“How did you know? I absolutely adore raw basilisk egg.” - Elsifor, Bogroot Demon (RPA-ADV6)

A Basilisk den is marked by lifelike stone statues littering the surrounding area, unsuspecting prey of the lurking creature;

Statues of Frogkin villagers pose in states of surprise among the chunks of broken glass. - Bogroot Demon (RPA-ADV6)

During an encounter with Yonlok, you are also faced with fighting his Basilisk familiar. - Explorer's Guide (GS-Guide - ADV5-23)