We can make Undead slaying potions (Zhaitan), Icebrood slaying potions (Jormag) and Destroyer slaying potions (Primordus), so why not for the other dragon minions? Setting the lack of a potion for Kralkatorrik’s Branded minions aside for the moment, how about something like this for Mordrem:
Powerful Potion of Mordrem Slaying
Nourishment (1h): +10% damage vs. Mordrem
-10% damage from Mordrem
+10% experience from kills
Self Poison: 10 s (840 damage)
- 1 Jug of Water
- 1 Pile of Crystalline Dust
- 250 Bloodstone Dust
- 25 Nopales
Make the recipe cost 400 Bandit Crests, just like the other recipes offered in the Silverwastes. The recipe (makes 5 potions) should be account-bound on acquire but the end-result potions should be sellable on the TP. BS dust is account-bound but that doesn’t necessarily mean something made with it has to be: see also Damask, Deldrimor Steel and Elonian Leather which are sellable despite containing account-bound mats.
Powerful-level only because for the most part Mordrem are Lv80 content anyway. The water and crystalline dust are common to all powerful slaying potions. A full stack of BS dust because it drops all over Tyria so why not put in a better sink than Mawdrey II for the blasted stuff? The nopales because they’re an ingredient with very few other uses which can only be found in Mordrem-infested areas, and since they have thorns they kind of fit the thorned-vine theme of Mordremoth.
The self-poison (similar to a corruption but as strong as Signet of Spite) should be there because as the Priory’s Chef Robertus pointed out, no good can come from feeding BS dust to living beings. That Norn from the story instance can be the recipe vendor, with some tale about trying to make food with BS dust but since it all turned out to be poisonous, selling this recipe to adventurers was the best he could do. 