Who is Malphas?
Malphas was a new boss added in Diablo 4 Season 3: Season of the Construct.
Malphas is a servant of Diablo, he's shapeless, manipulates others and takes on the form of others. In the Season of Constrcut, Malphas has taken the form of one of Zoltun Kulle's prize Constructs, The Guardian.
After ruling over the Vaults for many years, Malphas has now decided to expand his reach over the rest of Sanctuary.
Fighting Malphas
Malphas is the first stationary boss in Diablo 4. He stays rooted to the center of the boss arena and utlises projectiles and traps to attack the player.