Before continuing to review the HQ options in the New Chaos Space Marine codex, it is worthwhile pausing to examine the Gift of Mutation chaos reward. This reward costs 10 points for many chaos lords and aspiring champions, but is the reward worth taking before deployment?
To figure this out, I'm going to go through the possible results for the Gift of Mutation results and try to attach a points value to them. I'll then take a mean and see if that is worth more, or less, than the 10 points that it cost to purchase the upgrade.
Firstly, I note that six of the results of the chaos boon table ends up with nothing. We'll give that zero points. Both spawnhood and dark apotheosis must be re-rolled, so we'll ignore them. That gives a total of 32 possible outcomes, of which 6 result in nothing.
Let's go through the rest of the possible results. Unless otherwise stated, the points cost given has been sourced from 2 chaos codexes ago. The points cost before the slash is what its worth to a multi-wound character, the points cost after is to a single wound (aspiring champion type) character.
+1 attack is worth 10 / 5 points, in line with the old mark of Khorne (rather than daemonic mutation which costs more);
+1 strength is worth 10 / 5 points;
+1 weapon skill is tough to judge, but we'll simply call it 5 points and be done with it;
+1 ballistic skill is like WS, so again, we'll just call it 5 points;
+1 initiative is approximately the same as a mark of Slaanesh, so we'll give that 10 / 5 points;
+1 wound is worth 15 points;
+1 toughness is worth 10 points;
+1 armour save is worth 20 / 10 points ... I feel this might be slightly over-costed, but let's roll with it;
+1 strength on a ranged weapon is an oddity, so we'll give it 10 points, inline with the +1 melee
fleshbane is an interesting one, a bit like an enhanced poison attack, or daemon's noxious touch. Let's give that 10 points;
adamantium will helps with deny the witch, but its not over powerful. How about 5 points?;
shrouded gives a solid cover save (or cover save improvement) which we'll apply 15 / 10 points to;
eternal warrior is like the old daemonic rune ability which was worth 35 points. I think that's over-costed now, so we'll lower it to 20 points;
witch-eater is an oddity that circumstantially punishes enemy psykers. Probably about 10 points;
re-roll failed armour saves is very good. We're certainly looking at 20 / 15 points I'd suggest;
poisoned attacks - we'll apply a level 5 points to;
crusader - longer run moves are not too great, so how about 5 points;
hammer of wrath - an additional attack at I=10 is good - we'll adopt the same points cost as +1A which gives 10 / 5 points;
icy aura is a low initiative strike effect that amounts to +1A, so again, 10 / 5 points;
hatred means re-rolling misses in round one of combat, 15 / 10 points I think;
shred re-rolls failed wounds, and is certainly worthy of 15 / 10 points as above;
instant death attacks are okay, so we'll give them 10 points;
stubborn is not so great on a character since they're almost exclusively fearless, but on a squad leader it might prove okay once in a while: 0 / 5 points;
fleet is not as great as it was in 5th edition, so we'll append 5 points to that;
feel no pain is good and we'll go for 15 / 10 points on that one.
The final option is multiple boons which results in an average of 2.5 more boons. The average of all the above (including null results) is approx. 21 / 17 points.
What are the means of all the above?
Answer: 9 / 7 points.
It therefore seems that the gift of mutation boon is not quite worth taking. Let's suppose I've been a bit mean with some low points costs though. I'd need to find an extra approx.40 points for character abilities in the above reckoning. So maybe I've undercosted poisoned attacks ... there's 5 poitns. But then I'm struggling a little bit. At best, gift of mutation appears to be a break-even proposition for independant characters. But for regular squad leaders, I think we're going to forget about it.