Salen provides you with the herb as well as shards from Skyzhay's blog

Pikkupstix provides you OSRS GP with a bag of summoning pieces. Return to Salen What happens? Pikkupstix offers you this bag of shards. It's perfect. For the final step of the ingredients ritual, I will need two Salve Robes. Sanfew might have spares. They'll be back in the near future I'm certain.

You can visit Sanfew in the Herb shop on the upper floor of Tavelry. You are welcome, (player name). You've visited my humble house. Salen sent me. He's in desperate need of a pair Salve Robes. Here's the link. Please send my love to Salen. Visit Salen. We're grateful. Now, I'd like you to wear these robes in order to mix the potion. (Salve Robes require 35 Magic and 40 Prayer for wear, and the potion needs 65 Herblores to mix.)

Salen provides you with the herb as well as shards and vials filled with holy water. You will get an Salve Potion when you combine all the ingredients in the Holy Water Vial. Speak With Salen. Are you familiar with the Salve Potion It's right here. It's awesome! Now, I can have my city of travel back! It's true! What?

Salens' robes darken and he leaps from his chair to sprint out the door. Go to Tavelry for good food and armour. There will be a cutscene. With that foolish adventurer subdued, I have the power to reclaim this weak town. Pikkupstix and Drezel, Sanfew and Nature Spirit and the player: You're Salen! Gah! Are you confident that I won't stop you? Think again!

Salen summons two Demons of Level 196. This is sure to keep you busy. The Demon kills Nature Drezel and Sanfew and the Nature Spirit takes them back to his Hallow for Cure. It's just you and me! Let's go on! The Demon is Level 196 and can take your life quickly. Use your Melee Protector or Protect from Magic. If you don't, the Demonic Blast he uses will hit a 50-55. His Melee is a bit weaker and can only hit 25-40.

Kill the Demon, and buy OSRS gold run over to the Tavelry Stone Circle. Then, you will see a new Cutscene. They can't stop these druids! I can't stop you! Salen throws the Tainted Salve Water on the Altar of Guthix, and becomes an Level-198 Druidic Demon.