Where do you get the dragon slayer quest on rs

You start the quest dragonslayer at the champions guild just south-west of varrock. in order to enter the champions guild you must have 32 quest points. for the quest I recommend a combat lvl of 40+ because after all u are fighting a lvl 83 dragon. Also use the anti dragon shield obtained in the quest because if u dont u may die in a matter of seconds and get food like lobsters or higher and at least one strength potion if u need any help with the quest just add allmicro7 on runescape and message me. hope this helped!