Maliketh took less attempts but I reckon it’s a harder boss fight than melania, at least with her fight you have more healing / attack windows. Maliketh just doesn’t stop phase one or two it’s just a constant all out attack. Only reason I killed him was because I got the riposte during the start of his second phase which got his health down quite a bit.

These bosses are really hard and unbalanced, pretty sure they were created with summoning / spirits in mind.