Ahna, the Rod of the Pact Keeper is not, in fact, a spellcasting focus. Its description says only that it provides a bonus to spell attacks while held--so, Tari could hold the Rod in one hand while using the imbued wood focus in the other. Here's the Rod's description: Rod, rarity varies (requires attunement by a warlock) uncommon (+1), rare (+2), or very rare (+3) While holding this rod, you gain a bonus to spell attack rolls and to the saving throw DCs of your warlock spells. The bonus is determined by the rod’s rarity. In addition, you can regain one warlock spell slot as an action while holding the rod. You can’t use this property again until you finish a long rest. And, for ease of reference, here's the description for the imbued wood focus: 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
