Blow a raspberry in the fishing guild

Warning! Potential danger for Hardcore Ironman!

1. Go to the ::shops at home and trade the clue items shop. Buy an elemental shield, blue dragonhide chaps and a rune warhammer. You need 50 ranged to equip blue dragonhide and 40 attack to equip the rune warhammer.
2. If you have any max cape or a fishing skilling cape, right-click it to teleport to the fishing guild and go to step 4. If you don't use city teleports > Ardougne.
3. Walk north and exit Ardougne, keep walking north until you reach the fishing guild, which is a little bit to the west of the road. 
4. Go to the bank in the northern part of the guild, equip above items and perform the 'Raspberry' emote. A level 108 double agent will spawn, kill it to finish the clue!