Here are the OSRS quests that give you Slayer EXP once you complete them
| Quest | XP Reward | Requirements | Length |
| Monkey Madness II | 25,000 | 69 Slayer, 60 Hunter, 70 Crafting, 55 Agility, 55 Thieving | Very Long |
| The Path of Glouphire | 20,000 | 60 Strength, 56 Slayer, 45 Agility, 56 Thieving, 47 Ranged | Long |
| Lair of Tarn Razorlor | 5,000 | 40 Slayer and the completion of The Haunted Mine quest | Medium |
| Royal Trouble | 5,000 | 40 Slayer and 40 Agility, completed quest of Throne of Miscellania | Medium |
| Wanted! | 5,000 | 32 Quest Points and the completed quests: Priest in Peril, Rune Mysteries, The Lost Tribe, and Recruitment Drive | Long |
| Animal Magnetism | 1,000 | 35 Woodcutting, 31 Prayer, 30 Ranged, 19 Crafting, 18 Slayer and completion of the following quests: Priest in Peril, The Restless Ghost, Ernest the Chicken | Medium |
Monkey Madness 2
Monkey Madness II is known to be the 129th quest in the Old School Runescape, its prequel Monkey Madness 1. It’s also classified as an exclusive Grandmaster quest. If you remember, one of the characters in the first older quest Glough has gone missing. So, King Nardone Shareen decided to seek help from the players to find the war criminal and defeat him once more.
In this quest, the players will get to enjoy the 25,000 Slayer EXP when they complete all the tasks. However, this quest consists of five chapters, which means that you’ll have a long way to go to accumulate the rewards. But on the bright side, this quest also offers thousands of EXP for Agility(20,000 EXP), Thieving (15,000 EXXP), and Hunter (15,000), making it worth it.
Once completed, the quest gives the player four (4) quest points and various access to the different sites such as Crash Site, the bank of Ape Atoll, Oobapohk’s Javelin shop, and a new glider store.
The Path of Glouphrie
If you’ve played The Eyes of Glouphrie, this next quest with another hefty Slayer EXP reward is its sequel. In this quest, the players will know what happens next to the investigation of Glouphrie’s plan. It’s also the part of the game where the history of gnomes and the city of Arposandra will start to unfold.
In The Path of Glouphrie quest, 20,000 Slayer EXP is waiting for the players upon completion, along with 30,000 Strength and 5,000 for both Magic and Thieving. It also offers 1 quest point and access to Poison Waste Slayer Dungeon and to the new spirit tree. It’s also worth mentioning the two keys for treasure hunter and some teleportation ability.
Lair of Tarn Razorlor
In the Lair of Tarn Razarlor, the main goal is to kill Tarn Razorlor to get his diary for enhancing salve amulets. First, however, the players need to traverse the puzzle-like dungeon filled with undead creatures and complete the mini-quest to the lair of Tarn Razorlor and kill him.
But, you’re lucky if you have a Slayer Ring that you can use to quickly get to Tarn’s Lair and finish the quest. If you have the ring, you don’t have to go through the complicated dungeon.
Aside from the 5,000 Slayer EXP, the players who will complete the game will be rewarded with the Tarn’s diary and the Salve Amulet that they can use to fight the undead.
Royal Trouble
Royal Trouble is a quest for the players to find out the real deal between the two clashing Kingdom of Miscellenia and Etceteria. The player will act as the regent of a small kingdom on an island who needs to finish the adventure quest to prevent these huge Kingdoms from getting into some royal trouble and affecting everyone.
This quest offers rewards worth 1 quest point and a total of 20,000 coins. Upon completion, the players will get 5,000 experience points on three skills: Slayer, Agility, and Hitpoints.
Wanted!
The next quest in which the players can get Slayer EXP points is the Wanted!. Its main objective is for the players to find the man on the most wanted list. Once the player tracks him down, the quest will give them the reward of 1 quest point and access going to the White Knight’s Armoury.
Animal Magnetism
In this Animal Magnetism quest, the main goal is to help Ava, a new resident in Dyanor Manor, fix her bed to have a nice sleep. The tasks are mostly related to making the bed soft and comfortable. Upon completion, she will provide the player great rewards, including 1 quest point, 1,000 EXP for fletching, crafting, and slayer. It also offers 2,500 EXP for woodcutting.