Embarking on a journey in Old School RuneScape (OSRS) involves skill training, and diaries provide a structured way to challenge yourself. Diaries require a significant amount of skills to complete, with some being more demanding than others. Let's delve into the OSRS diaries with the highest skill requirements.

Before we begin, it's essential to note that the skill requirements for diaries can change from task to task within the same diary. Here, we'll focus on the high-level skill requirements for some of the most challenging diaries.

Ardougne Diary
The Ardougne Diary, part of the Easy, Medium, Hard, and Elite Ardougne diaries, is notorious for its high skill requirements. The Elite Tasks, in particular, demand a high level in various skills.

To complete the Elite Ardougne Diary, you'll need a high level in combat and non-combat skills. The tasks include:
Pest Control

The Pest Control activity demands high-level combat skills, with the recommendation of at least 90 in all combat skills. This task requires protecting the godine from invading creatures, testing your combat prowess.
You'll also need a high-level of Agility (70+) for the rapid navigation through the pest-controlled room, and a significant amount of Runecrafting (55+) to create essence packs for protection.
Bios Assassins' Assault

This task necessitates a high-level of Thieving (85+) to navigate the Sunken Pyramid and steal the lunar staff. Furthermore, you'll need a high level of Combat skills (at least 90 in all) to defeat enemies and a considerable amount of Mining (70+) to navigate the pyramid undetected.
Morytania Diary
The Morytania Diary, another challenging diary, requires high-level skills for its tasks. The hard and elite versions of this diary provide a stern test for even the most seasoned OSRS players.

The tasks in the Morytania Diary demand high-level skills in multiple areas:
Curse of Arrav









This task necessitates a high-level of Combat skills (minimum 90 in all) to navigate through Silvyr's mansion and defeat the vampires. You'll also need a high-level of Thieving (70+) to pick locks and steal items.
Moreover, a significant amount of Firemaking (50+) is required to light fires in the mansion, and a high level of Agility (70+) is needed for navigating the mansion's treacherous floors.
Darkmeyer Tasks
Darkmeyer tasks demand high-level skills across the board. You'll need a high level of Combat skills (at least 90 in all) to deal with the powerful enemies and boss fights. Additionally, a high-level of Construction (80+) is required for crafting certain items, and a significant amount of Thieving (80+) for stealing from Meiyerditch's spies.
The Slayer skill (80+) is also needed to combat the unique demons found in Darkmeyer. Finally, you'll need a high-level of Runecrafting (60+) to create a soul talisman for accessing the city.
Completing these diaries with the highest skill requirements is a rewarding challenge, offering considerable rewards and recognition among the OSRS community. If you find yourself struggling with any of these tasks, don't hesitate to ask for help in the OSRS community or seek advice from experienced players. Happy diarying!