Hi everyone! i'm a relatively new player who wants to finally start an army for Horus Heresy. My choice is the Word Bearers, last of the serrated sun rite of war. Building my list, i had troubles finding the right hq to guide my forces. i know that word bearers must have a chaplain, and my third choice was either a moritat to go with the ascen circle or a sanctic esoterist to cast hammerhand on the gal vorbaks. Regarding the warlord, i was leaning towards a legion herald, it's a good option but gal vorbaks aren't affected by him, or Zardu Layak to back them up more.
Which hq should i choose and why? Thanks!