Rose of rubies seems weirdly niche now. Assuming you start at 50 hp, rose will proc about 15 times now, giving 45 omni damage. Getting verdant 3, which is a lot harder to incidentally get now with common vestiges only giving a single set bonus, gives you 3 hp a combat. With there being 4 combats a book, that is an extra 6 procs or 18 omni damage per book. Facing the book 1 guardian with ~20 hp and ~60 extra omni damage doesn't sound good.
With death scythe being capped, the only ways I can think to gain max hp at any decent rate is verdant 8 or restoration with the epic +1 max hp augment. Restoration is maybe 2 casts a turn on average, assuming expert binder or some heavy starwalker investment. So thats ~3 omni damage a turn. You'd need a second or third of the epic augment and some orb generation to get that to really start bringing in the omni damage. There is a build there somewhere, but you are still spending the majority of the run with <25 max hp, and have already invested a lot so it is hard to also get shield or blur. To compare to shadow 7's 350 omni damage, you need ~30 turns of combat with the build going (say +12 omni damage a turn because you've +8 hp from 4 +2 restorations a turn) to match the extra omni damage. Not impossible, but requires a specific binding with 2 specific epic augments, expert binder 3, and 2 leaky pens worth of orb generation to get going.
Verdant 8 is capped at +3 hp a turn which is ~9 omni damage every two turns or 4.5 omni damage a turn. It also has the downside of not making much use of verdant 5's +10% attack binding damage per 10 hp, since you are stuck at <30 hp. There is a bit of a power flatline going from verdant 3 to verdant 8. I don't have any concrete ideas for what to build in the interim so that the build is strong enough to get to verdant 8. You've got something like 60 omni damage and +20% attack binding damage to work with by the first guardian and not much else.
TL;DR: Rose of rubies is kinda -30 max hp, +45 omni damage, you have very limited options to get much more out of it