Blizzard has announced the four spawn times for each Beta weekend for the World Boss Ashava the Pestilent. Everyone will be able to fight Ashava on March 25, while players who have access to the Early Access Beta will be able to battle the World Boss a week earlier on March 18. The exact times to combat the World Boss during the Open Beta and Early Access weekends are as follows:
Early Access Beta: March 18 at 10 a.m., 12 p.m., 10 p.m. and midnight PDT
Open Beta: March 25 at 10 a.m., 12 p.m.