Talk:Vol.2 Ch.181: 38F - Hell Train: The Dallar Show (10)/@comment-5693502-20151221004956/@comment-26854521-20151222175718

Well my point wasn't that  they are indeed/confirmed invincible/unkillable, but that there are at least a few things pointing towards it and I've also mentioned it before that I don't take this as an absolute confirmation by any means.

You could also think about a few things here if you do assume that the other Heads cannot be killed by ordinary means based on a Guadain contract (hypothetically). We know that the 10 Heads and Zahard gained immortality on the 100th floor, except for Bloodmadder.

What if there was something similar with the invincibility? What if at that time one of them had to die in order for them to gain it, and that might have been the missing 10th Family Head.

I also don't think that FUG would necessarily be that upset with the 10 Familiy Heads just because they stand on top of everything just because they are strong, but instead because their position is cemented and protected by contracts. While it is certainly possible that being strong because of the granted contracts might also be a good enough reason for them to be upset.