The worm that you have lost will reappear in Moltara.
You give him the glowing worms that you found around moltara. username on neopets: horseeys1998
You go to the lantern place at moltara and then it will say "something has happened! you have found a empty lantern on the floor!"
It is right were the steps are to go to the caves. Keep refreshing and then you will find it.
There is no true magma leader, but famous Moltarians that lead certain activities are the Mayor of Moltara and Aldric Beign, the Altador Cup Captain of the Moltara Team. You can find the Mayor of Moltara at the City Hall, and Aldric Beign at the Altador Cup.
You can sneak past him when he is asleep but I don't know when he is asleep my mum told me.
You have to go into the light shop in moltara and get an empty lantern (its free). Then you collect the worms in moltara they are all over the place and some are really rare to see. Next you go to your inventory and click on the lantern and choose to put all the worms in there, enjoy finding your way around in the cave ;-D
You must collect the 10 coloured worms located at moltara city, main map and the cave thing. and then fill it,
They are used to build petpets in one of Moltara's shops. You need the gears, scrap metal, Red Moltite and Obsidian.
They don't appear at specfic times, they appear randomly in (I think) periods of 10 minutes. So if you look at one Moltara area and don't see any, refreshing straight away won't ever help, you need to check again 10 minutes later (or so) and see if any have appeared.
If you're talking about the Magma Pool in Moltara, it's random. Just keep refreshing and eventually he'll be asleep and you can sneak in. Otherwise, you have to be "wise in the ways of Moltara" or whatever, and I'm afraid I'm not sure on that one... but this might help a bit: http://www.neopets.com/~Reniaa#Mpets Good luck! =)
It is Located in Moltara but I think that the worm quests are over...