Gaunt's Ghosts/Horus Heresy "Power Bows"

[Cereal n' Milk]

In one Black Library novel I read, there was one battle where the protagonists fought a city's guard that had "power bows" for lack of a better term. They fired a beam of energy instead of arrows, and I was wondering what book it was in. I believe it was either from the Horus Heresy or Gaunt's Ghosts series, but I could not remember which. I wanted to see if I could model something like this and I wanted descriptions I could go from. If anyone knows what book or series they're from, that would be great.

[matrent89]

That would be Horus Rising, the first book in the Horus Heresy at the very end of the book.

[wittdooley]

I was unaware that Horus conquered the Forest world of Kashyyk.

http://mimg.ugo.com/201005/43714/cuts/11-chewbacca_288x288.jpg

[Grailkeeper]

In the Gaunts ghost series Eszrah ap Niht uses a "Reynbow"

[wittdooley]

Wait... are you sure we aren't talking about this kind of Bow?

http://static.foxsports.com/content/fscom/img/2011/10/27/102711-NFL-Tim-Tebow-Tebowing-JW_20111027151429173_660_320.JPG

[doom-kitten]

He means the Interex from the first Horus Heresy novel, they used energy weapons that looked like bows, I believe Aximand or Abaddon mocks the weapon until they find out the "arrows" fired from them literally pass through power armour.