Simple as the title makes. I enjoy brainstorming what requirements and steps most people enjoy. From quick and fast emotes, to talk to this NPC. General extreme endgame progression that takes effort on the player to achieve.
COLLECTION METHOD
Would need to be very difficult to get. Such as 1/100 from masters or something else.
Along the lines of:
EMOTES
-[Emote] next to Lady Trah with a Pickaxe of Earth and Song, 120 mining cape, Croesus sporehammer.
-[Emote] next to Lady Ithell with a Blessed Flask, 120 crafting cape, Artificiers Measure.
NPC
-Talk to TzKal-Zuk after completing a flawless HardMode run
-Show Max your Max Cape
-Tell the Wise Old Man a tale from your Master Quest Cape journey
-Show The Raptor a bronze enrage title (zammy/telos/glacor)
Idk throw out other fun ideas that could be more fun than scanning Chaos Tunnels or completing a lap of Dorgesh Kaan agility course. 

Carrying the clue while entering the wilderness will offer you a one-off ((each time you get this step)) boost to 10 threat so you don't have to wait around for ages