You can either pay the goblin in port sarim 10k or you can mage him and telekinetic grab the map piece. I recommend the tele-grab although it requires level 33 magic.
If you drop the map pieces, you will need to obtain them the exact same way you did before, the hard way.
but they dont say anthing about worm brain or the map piece they just keep fighting
try speaking to oziach first
Check for the yellow slayer master symbol on the map or minimap. It looks like a skull - at least, that's what it looks like to me. On the World Map, you can activate the list of keys with the question mark in the lower left; select the category "Slayer Masters" to make them stand out on the map. However, some slayer masters are underground; better look up an article - for example, on runescape.wikia.com - about "Slayer Master", to get more details about the locations.
erm your supposed to kill Elvarg which is lvl 80+, close to a lesser demon which is also about the same level In melzars maze you have to kill a lesser demon to open a door for a map piece.
There are a number of ways to get a Whip in Runescape. The first is to buy it from the Grand Exchange, price is currently 1M. Second is to get it as a drop from another player in PvP, or buy it from someone. Third is to achieve 85 slayer, once you have this go to the slayer tower in the Canifis(check runescape world map for directions) They aren't that rare of a drop, although you definitely wont get one every kill. It could take 100-1000 kills to get one, its all chance.
Deep Wilderness, on the World Map look for "Lava Maze". He's in there.
Play team slayer and get it as a map choice.
Talk to the Guildmaster in the Champions' Guild. After asking him for a quest, he will tell you to talk to Oziach, who is located west of Edgeville in a small house very close to the Wilderness. Oziach says that to be able to buy a rune platebody from him, you have to kill Elvarg the dragon, who is located on Crandor Isle. He will tell you to go the Guildmaster for information on how to kill Elvarg. Ask the Guildmaster about ALL three map pieces and he will give you the key to Melzar's Maze.NOTE: You must talk to him about all three map pieces, or else you cannot obtain them.
For a regular slayer map you wouldn't change the spawns to a color unless it was a team slayer(it's also important to make initial spawn points)also spawn stuff in forge
look on the runescape map and for the water sign
In the map, select vasalakar lair. There u can find Galanoth. do his quest and unlock his shop to buy a new Armour called dragon slayer. It looks like the Galanoth's Armour