That all looks pretty reasonable as far as
raw rules. A couple things that jumped out at me:
Blessed Hull: This one feels just a little odd to me. The only armies that really have much in the way of lance weapons are eldar, dark eldar, and corsairs. Lance only ever matters against
AV 13 or higher meaning you'll probably only put this relic on a landraider or possibly a vindicator or ironclad. Craftworlders don't generally rely on their lances all that heavily anyway, so this is no big deal to them. Dark eldar, however, have been known to build lists that revolve around taking as many lances and blasters as possible. So if you face a dark eldar player who went for blasters and/or lances instead of haywire scourges and haywire grenades, you're potentially presenting him with an indestructibility upgrade for 10 points. So depending on what your meta looks like, this upgrade is either harmlessly cheap and also mostly useless, or else it's a 10 point upgrade to potentially screw over an already sub-par army. Not sure how much it affects corsairs.
It's probably fine. It's just that it's not useful 90% of the time, reasonable 5% of the time, and arguably too good 5% of the time depending on your opponent. I realize it's a throwback to the olden days.
Armor of Honor:
The rules themselves seem fine here. How does the pricetag compare? How much is set of terminator armor normally, and how many extra points are you paying to be able to sweep and swing at initiative?
Blade of Armageddon:
How much is a relic blade normally? I thought they were 20 or 25 points, and I'm 99% sure they're at least 15 points. Meaning you're paying basically nothing (or negative points?) to mastercraft an already good weapon and give it armor bane. Again, nothing problematic ruleswise. The pricetag just looks suspicious.
Holy Relic:
*Squint* Proooobably fine. That's a pretty solid set of buffs that could be potentially devastating on the turn a bunch of
BT units dive into close combat. Especially since you can (as far as I'm aware) stack it with a banner. That said, it's a one-use item that rewards melee in an army that wants to melee but isn't innately great at it. Plus it can be killed off before it's used. Probably fine. Probably.