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Jekyll and Hyde was a random event before the 25 February update. Occasionally, the player would be approached by a man named Dr. Jekyll who desperately begged for help. Dr Jekyll approached the player and asked for the highest level clean herb that the player had; he asked for Guam Leaf if player had no herbs. In return, Dr Jekyll would give the player a potion (see list). A player could choose not to help, then Dr Jekyll would go find someone else to help him and the player received a strength potion(2).
If the player ignored him, he would transform into Mr Hyde (level 14-159, depending on the player's combat level), who fought with melee. When killed, he would drop a potion, similar to if he was given a herb. However, sometimes he dropped an empty vial. Killing him could sometimes be more profitable than giving him a herb, as he could possibly drop a Super restore potion (4), although this is no longer possible.
The list, which potion Dr. Jekyll gave for the herb:
|no herb||Strength potion (2)|
|Guam leaf||*Strength potion (4)|
|Tarromin||*Attack potion (4)|
|Harralander||Stat restore potion (4)|
|Ranarr weed||Energy potion (4)|
|Toadflax||Defence potion (4)|
|Irit leaf||Agility potion (4)|
|Avantoe||Super attack potion (4)|
|Kwuarm||Super energy potion (4)|
|Snapdragon||Super strength potion (4)|
|Cadantine||Super restore potion (4)|
|Lantadyme||Super defence potion (4)|
|Dwarf weed||Magic potion (4)|
|Torstol||(will be ignored)|
|Uncleaned herbs||(will be ignored)|
*For Ranarr and above, the potion given is 1 level below the herb
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Big fish • Candlelight • Dr. Ford • Drunken Dwarf • Ent • Evil Chicken • Exploding rock • Jekyll and Hyde • Lost Pirate • Poison Gas • Rick Turpentine • Rock Golem • Security Guard • Shade • Strange plant • Swarm • Tangle Vine • Tree spirit • Watchman • Whirlpool • Zombie