What other weapons might suit Mortarion?

Primarchs often wielded numerous weapons in battle.

For example, the scene on the Horus Heresy cover where Corax is wielding a Meltagun and leading his sons on a stealth mission was particularly striking.

What about Mortarion, then?

What secondary weapons did he use while Silence and Lantern was under maintenance, and which ones do you think suited him best?

Feel free to share your thoughts!