There is a rumor saying before you can get a Draconic visage. you must speak to "oziach" in Edgeville in the very north west corner before crossing the wilderness. Before you can talk to oziach about the draconic visage you must have completed the Dragon slayer quest.. Thing of it is.. I have killed about 5k Iron/steel dragons combine. and yes my first one I found was about 120 after I completed the quest and let Oziach educate me about attaching a "Draconic Visage" to my anti-dragon shield.. So does it increase your chances of getting the drop I dunno? proven fact though stated by Jagex is that Draconic visage Is a "Bonus Item" there are common, rare, and super rare "Bonus Items" for example Charms.. are a common bonus item. There are 100% complete random drop.. people say 3% chance of blue charm dropping from a iron dragon.. thats 1/33.3' This isnt true it is a bonus item and a Random drop. you could get lucky and find a few from every dragon or none out of 200 dragons.. It is random and Luck.. no skill no quest nothing but random and luck.. Visage on the other hand is a super rare bonus item.. there is no such drop rate. it is a random drop.. you can kill 50,000 and not get 1 if your the most unlucky in all runescape. and u could get 2-3 in a row.. "Most unlikely" but possible.. so if the question is still asked do I need to talk to Oziach?? why not just do it? If your killing anything that can possibly drop a visage. your well over a level of being able to very easily complete dragon slayer.. hope that helps..