toothbrush

Beer, Stormfall Beer, made from the hops and barley of his own warehouses, procured from his own feifs.

The background in Oberon's vacation picture just looks similar to a Corona Beer poster.  Actually, you've got several to choose from: the Succubus Stout, the Great Lord Lager, the Barbarian Brown Ale (my favorite), the Paladin Pale Ale, the Pikeman Pilsner, to name a few.  Oberon is considering becoming a master brewer to boost troop moral and bring in added revenue.  His dragons also imbibe from time to time and the creators of Stormfall are considering offering a tavern within the castle walls.  The tavern serves several purposes: to bring in extra revenue, to offer a meeting place for his troops to hang out away from the dreary catacombs, a place of intrigue where important information is exchanged about important upcoming events and a place for his league commanders and league members to chat, similar to the league chat function.     

we all know the holy trinity of resources being  GOLD *    FOOD *  and  * IRON   failing to have the right amount of any of those items results in the use of sapphires to purchase said items. there using this this train of thought I feel the only logical answer would be..................