"Andariel was the only female Evil. She aided the Lesser Evils for many years, but eventually, she lost faith in their plots. Two decades ago, she chose to help Diablo during his resurgence and seized the Citadel of the Sightless Eye. Ultimately, she perished at the hands of brave heroes." - Deckard Cain
Andariel is the Act I boss for Diablo II Resurrected. Her main ability is the Poison Spray that spreads in a large area. Melee combat will also poison you.
Defeating Andariel
1. Antidote Potions. Make sure to drink one before engaging her to battle. Antidote Potion gives you +50 Poison Resistance making you take less damage from her attacks. Of course, bring extra as well.
2. Use any Fire-based damage. Andariel has a Fire Resistance of -50
3. If you are having difficulty dodging her Poison Spray, lure her to the open space below the map. Its easier to run around the pit
If you have decent equipment, beating her shouldn't be any problem. Make sure to open a Town Portal before engaging. So it's easy to get back should you die from the encounter.