My sanaki is spd+ and def-. Why is rauorraven good for sanaki if her defense is so little? It checks maybe staves, but they have little presence on the meta and sanaki has 34 res. Bows would destroy her (although after the raven she'll have 40% advantage). Should I give her it?
The reason rauorraven works is because of triangle adept, that 40% (I think it's really 44% because it multiplies not adds) that you mentioned is pretty significant and it would prevent you from dying to a bow even with sanaki's low defense. You can also go the route of rauorblade with a buffer if you don't think you need a bow/staff/dagger counter.
Its good on her because it allows her to check colorless and kill them when she initiates, pretty much all bow and dagger users (except Felicia). She actually orko's bows if they initiate on her, cuz Triangle adept stacks with Raven tomes.
If you already have a 5 star Henry i'd say yes, if you don't tho, the regular Raven still works very well
You should check the damage calculator to see if you can still 1HKO Hector after you switch to the Raven tome before investing in it. Without a +Atk nature I'm not sure she still gets that kill after the might drop from switching to the Raven tome.
Edit: Ran it myself, she needs a +Atk nature to secure the kill against Hector. Even with +Atk, she barely gets it at 52 damage (his neutral health). +Res and +HP hectors still won't die. Arena Hectors typically run HP+3 seal as well, which makes it even worse. So if checking Hector is big on your list of priorities, you should leave on Cymbeline and add the Atk+1 seal to keep the kill through HP+3 seal.
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