Wyvern Marrow

How do i get tis item ? i hunted rathalos,rathain,basarious,gravious lyk lots of time and i still dun get it ! Could some1 tell me how do i get tis item ?
Much appreciated >O<

I would make both of them. But the red saber can be upgraded more than corona.

From High Rankrathalos. 5* in the guild i think, you can also look for los quest in 4* guild quest but i don't think so it would be there. You need to rank up to hr2.

So i was wrong in the end . You have to do some quest in guild 4* and unlock an urgent quest which is famous Four...wait for it..Horns. You have to slay two high rank diablos alone or (if you have some friend/s) in multi. Don't worry most of people made this quest alone me too;] . If you need a training do all 1-3* quests in guild you'll get some materials and train your skills. Did you beat elder lao already??

I'm afraid you're wrong:
complete these 4* guild quests
The Land Shark
Trouble in the Swamp
Jungle Menace
Attack of the Yian Kut-Ku
Catch a Yian Kut-Ku
Catch a Gypceros
to unlock hr2 urgent four horns.

Look into a four horn thread first, there is plenty info, tactics and hints. Read that first than if you'll need more help ask me i'll try to help. First try to make plessie watersword or frozen edge+.

Probably yes completing all quests will be the best choice.

You can get Wyvern Marrow from Rathalos and Rathaian. I get it so much i just sell it. I have no need for those swords. I use the Obelion It has a high Dragon att it kills EVERYTHING! And white Monoblos. Can be battled when you get to 5* quests on the village cheif. The Urgent quests. You gotta do all for the 5* missions first. After you kill the normal mono you get to fight the white one.
BTW Obelion took down the mono (and the diablos) in minutes. Its a truely beautiful sword. But is really hard to obtain Trust me... -.-