Runescape gold for getting through in another way.

For this part ,to get runescape gold you will need a anti poison potion (it's a good idea to bring two, one for the son and one for you), probably some good armor, a good weapon, all of the runes needed to cast all four blast spells, and either a level 59 magic, or a Wizard's Mind Bomb (can be bought in Falador Bar for 2 coins). A Wizard's Mind Bomb temporarily increases you 3 magic levels, so you can do this part if you have a level 56 magic or higher. Once you have all of those items go to the Jolly Boar Inn. This is located northeast of Varrock. Look on the world map if you can't find it (it is the big bar). Go inside and go to the southern end. On the second floor you will find, in a room, a wizard. He is the third son. Talk to him, but he has been poisoned. Use one of your anti poison potions on him and he will be cured. He will tell you all about the poison spiders, and about Chronozon (lvl 170) having his piece of the crest. He will tell you that in order to kill Chronozon you will need to cast all of the blast spells on him. Now get all of the items mentioned in step 1 and go to Edgeville. Head south of the bank into the the dungeon marked with a "!" on the map below. Fairly deep into the dungeon you will find the runescape gold.

Runescape Gold Runescape Money