The following features are granted to you while the appropriate focus is equipped.
A charged focus lowers a spell's critical hit threshold by 1.
An empowered focus grants a +1 bonus to spell attacks and DC.
An inscripted focus grants a number of additional spells prepared equal to the ability modifier used for the spellcasting feature.
A resonant focus grants an additional attunement slot.
A vessel focus grants 2 additional mana points per cleric, druid, and wizard level, or 1 additional mana point per artificer, magus, paladin, and ranger level.
This focus can be attached, bore, or worn visibly on an armor, clothing, or weapon, without requiring a free hand to have it equipped.
Training with a focus allows you to prepare and use the spells from the list of spells tied to that focus. You also use your training bonus for the attacks and DC for those spells.
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A focus doesn't have any uses beyond the Spellcast action. It can be used as an improvised weapon, but it is destroyed on a critical miss.