We had a rather interesting discussion on hordes and flame weapons today. So how exactly does a flamer work against horde. Going by RAW you inflict automatic hits. What happens then, does the horde have to roll agility for each hit, to see whether damage is inflicted, does the horde roll agility once to see wether the flamer is able to damage it at all (rather contradictory with auto hits) or does the horde simply recieve normal damage for each hit as per flamer statline (seems to be the way errata indicates it, as the horde normally does not dodge or parry, so it probably also does not use agility to avoid flamer attacks), which for each individual hit might lead to magnitude loss.
Second point was unrelenting devastation, cleanse and purify and flamer interaction. Say a dev with UD and cleans and purify fires his heavy flamer upon a horde, the number of hits he gets is 8+1d5 (heavy flamer) +1d5 (cleanse and purify) are all those hits doubled by UD ? If the erratas point in UDs case was to reduce its effectiveness for blast, would the same apply for flame (potential for 20-36 hits in the example i mentioned)? Is there a rule somewhere in the book regarding multipliers and additional dice like multiply first add bonus dice later, or roll and add bonus dice then multiply , i have a vague feeling, things like that are handled in a different way for each individual situation.