[RPG] use a spider leg as wand for the druidic focus

dnd-5edruidspellcasting-focus

So I'm making a hill dwarf underdark druid who became a druid because while exploring he came across the mother of all giant spiders that for some reason gave him a long look and let him live. Renouncing all claim on his family's businesses and position in society he disappeared into the underdark. The question is with no wood and a special focus on spiders would it be acceptable to make a wand out of a spider leg. I figure it's natural and the chitinous nature of it could make it suitable. I'd allow it but I'm very new to the game and DMing. I also get super excited for random sideways thinking like this

Best Answer

Probably

Druidic Focus. A druidic focus might be a sprig of mistletoe or holly, a wand or scepter made of yew or another special wood, a staff drawn whole out of a living tree, or a totem object incorporating feathers, fur, bones, and teeth from sacred animals. A druid can use such an object as a spellcasting focus.

A wand made from a spider's leg sounds a lot like "a totem object incorporating [body parts] from sacred animals", but it's perhaps up to DM discretion.

I'd assume most DMs should allow it, regardless of whether they might consider the spider "sacred" to your druid, because it is a very specific item and shouldn't upset the balance of the game in any way–you're still able to have it taken from you, you need to hold it to cast spells, and you can't just craft one from at will.