Players with the appropriate construction level can build stash units to store emote clue items near where the emote clue is located, saving bank space. A list of items used in each level of treasure trail can be found here. Osrs wiki clues page. In osrs, you can juggle clues as a method to stack them. Elite clues generally come passively through pvm, as virtually every boss drops elite clues.
For hard/elite/master, you get a boost for your attack/strength/ranged levels being. Stash units (short for store things and stuff here), also known as hidey holes, are storage units for emote clue items, saving bank space and bank trips for players who do treasure trails frequently.
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