The way to obtain Viconia's Walking Fortress in Baldur's Gate 3 is relatively simple. You can get it by killing Viconia in the Mansion of Mourn. After obtaining it, players can equip the weapon and use it.
Answer: Players can get it by killing Viconia in the Mansion of Sorrow.
The weapon Viconia's Walking Fortress can add a certain amount of armor to the player when used.
When being attacked by an enemy, you can quickly use reaction actions to cause damage to the target.
If you can still use the saving throw while lying down, you will have a certain advantage.
Overall, it is a pretty good skill. Players will have a certain advantage in battle after using it.