From Lexicanum

Malus is a Silver Skulls Apothecary. He is one of many Apothecaries who met with Inquisitor Thraxx when he visited their homeworld, Varsavia. He gave Thraxx a tour of the planet's Apothecarion, allowing him to inspect the chapter's gene-seed. When not in combat he wore a long white robe.^1-p2

Sources

• ¹:Index Astartes I