It is a trap, Rito is trying to bait you into buying rageblade which is honestly inefficient on these champions.
Kepp building crit on yi, brusier on shyv, assasin or brusier on noct. rageblade is a noobtrap.
Sightless661 votesKepp building crit on yi,
If I can be picky for a moment, you probably shouldn't do that either. Bloodrazor into armor-pen on-hit is generally better than crit on Yi. Things like ghostblade, BC, and BotRK will serve you better than crit will. Gets you more early power and it is easier to splash in some tankiness. Crit is almost as much of a trap as rageblade. It's obviously not as bad as rageblade because nothing is quite that bad, but it's still a trap.
The Deckowner2 voteswell the reason I didn't mention the BC build is becuase i think it is getting nerfed soon, but for now that build is probabaly still good.
crit yi is better for rekting noobs tho, that moment when you alpha and cirt for tons of dmg is worth the crappy early game suffer.
Wenderwall1 votesHow abt.
on shyv?
The Deckowner3 votesyou will get blow up
Wenderwall1 votesCombined with cinderhulk +800 HP, it might work similar to on-hit AS hybrid shyvana.
The Deckowner1 votespure hp without resistance is not useful.
Wenderwall1 votesDevourer Shyv wasn't tank, with +Burnout, enemy will be slowed for ~11 sec and do all the AA's and use E to finish off anyone running away or to runaway.
PapaGreg211 votesYou are better off just going BOTRK if you want a slow because you can utilize the AS and AD better than the health and AP from Rylai's IMO
Wenderwall1 votesI was thinking 
but it's gonna be changed in 6.11. so how about
,
.
Agreed Bork active is good, but when going as jg and teamfights Rylai will outplay bork all the time. Hp will work good with hydra as well. It'll wil work with shyv's W, E & R.
All this is theory, I'll be testing it in soloQ.
The Deckowner1 voteswhat kind of devourer shyvana are you even talking about? every devourer shyvana i see is building devourer titanic hydra into full tank.
Ozag the Mighty1 votes
warpenguin5551 votesyeah ive seen a few of my freinds try rageblade nocturne. its bad please dont do it.
Br4ndon1 votesI'd say it has its uses on both shyv and yi. But Noc definitely uses it with the least effectiveness of all 3. The only onhit he has is his passive, which isnt worth investing that much gold for.