There are 3 Way(s) you can get a Draconic Visage:
-1st Way-
Killing the King Black Dragon or a regular black dragon ( Rare Drop ).
-2nd Way- ( Best )
Killing the Mithril Dragon, ( Rare Drop ) also drops Dragon Full Helm ( V Rare Drop )
-3rd Way- ( Easiest )
Buying it off another player, either in the grand exchange, or on world 2.
from what i know i would suggest 10k to be the the odds of it dropping visage
Draconic visage (1/8500kills)
The ring of wealth does increase the chance of a draconic visage drop; However it does not increase the chance of some things such as clue scrolls. That is incorrect. The Draconic Visage is a bonus drop, and, therefore, is NOT affected by a Ring of Wealth. CrushAnswer
As I've said before there is no exact percentage on how often iron dragons drop draconic visage's but just that it is a very rare drop.
No. ~Angelsblade0~
from what i know i would suggest 10k to be the the odds of it dropping visage
Draconic visage (1/8500kills)
1/4500, maybe less if you are lucky.Note: Draconic Visage is listed as a "Bonus Drop!" This means that the Dragon Dropping this may also have another valuable drop such as D Legs to go with it for example!
The ring of wealth does increase the chance of a draconic visage drop; However it does not increase the chance of some things such as clue scrolls. That is incorrect. The Draconic Visage is a bonus drop, and, therefore, is NOT affected by a Ring of Wealth. CrushAnswer
As I've said before there is no exact percentage on how often iron dragons drop draconic visage's but just that it is a very rare drop.
I presume you was referring to the Draconic Visage. It drops from most if not all dragons. Mainly Black dragons and metal dragons most.
No. ~Angelsblade0~
No one really knows but it is estimated to be around 1/6000. However, you could kill 5 and get one or kill 20,000 and not get one.... I dont agree, the drop rate of draconic visage is around 0.001% (I.E 1/1000). i personally got a visage in 60 kills. And I got one on my first black dragon kill of a slayer task.. it's all random.
There is no set number of how many times you need to kill an iron dragon to obtain a draconic visage. Some people can obtain a visage within 100 kills and a lucky few even their first however around 99% of people find trying to obtain a visage very hard as the drop rate is estimated from 1/2500 all the way to 1/15000! I myself have killed around 10,5k Dragons in total and around 1,200 of those kills being the King Black Dragon. I have failed to obtain a visage so far. Good Luck and don't give up hope!
The chance of obtaining a Draconic visage drop from a Black dragon is estimated at 1/13,099 using gathered Adventurer's Log data as of 18 September 2012.
they are used to make the dragon fire shield can be sold for a fair amount of gp.
The King Black Dragon drops draconic visages very rarely there is no actual % of drops but their dropped very rarely about as rare as cannoneers drop dragon picks