Source: Eberron - Rising from the Last War

Wondrous item, common (requires attunement)

An imbued wood focus is a rod, staff, or wand cut from a tree infused with extraplanar energy. If you're a spellcaster, you can use this orb as a spellcasting focus.

When you cast a damage-dealing spell using this item as your spellcasting focus, you gain a +1 bonus to one damage roll of the spell, provided the damage is of the type associated with the item's wood. The types of wood and their associated damage types are listed in the Imbued Wood Focus table.

Imbued Wood Focus
Wood Damage Type
Fernian Ash Fire
Irian Rosewood Radiant
Kythrian Manchineel Acid or poison
Lamannian Oak Lightning or thunder
Mabaran Ebony Necrotic
Risian Pine Cold
Shavarran Birch Force
Xorian Wenge Psychic