First you need to obtain a dragonic visage. Obtain by drops by METALLIC DRAGONS!Chances of it dropping 1/2500.
If you have 95 smithing, craft together with anti-fire shield. or If you dont, 95k and bring both items to Ozaich, he'll smith it for you.
A dragon fire shield kinda looks like a square shield but it is orange and has a dragon on it.
No it cannot. There are only two shields that can protect you from dragon fire, and those are the "Anti-Dragon Shield" and the much more expensive "Dragon Fire Shield". The Anit-Dragon simply protects you from the flame, but the Dragon Fire sort of collects the flame and so can shoot it back out after 50 dragon fire breaths.
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i dont know about an anti dragon shield but i know that you can get a replacement anti-dragonbreath shield from the duke of lumbridge
If you have the money for it, Dragon Fire shield ( Fully Charged ) The second best - Rune Defender.
About 6-7 :)
they are used to make the dragon fire shield can be sold for a fair amount of gp.
If by 'dfs' you mean the dragon fire shield, the requirement is 75 defence.
it is a shield
Drink an Anti Fire potion. It protects you from dragon fire for five minutes just as well as an anti dragonshield.
Get an anti-dragon shield, dragonfire shield, or an antifire potion and an anti-dragon shield to stop the fire breath. Then just fight it like a normal enemy. If it's combat level is high compared to yours bring food and potions. If your fighting Elvarg, she will drain your prayer, too.
You only get pure fire dragon when breeding a fire dragon with a pure dragon. A pure dragon can be bred with two legendary dragons.