Staff Expert – Feat

General Feat (Prerequisite: Level 4+)

You’ve unlocked the deadly ranged potential of the Staff. You gain the following benefits.

• Arcane Artillery. When you cast a spell that has a range of 5 feet or greater using a Staff as your Spellcasting Focus, you can use a Bonus Action to double the range of the spell.
• Powerful Focus. When you roll a 1 or 2 on a damage die for a cantrip you cast using a Staff as a Spellcasting Focus, you can reroll the die and must use the new roll, even if the new roll is a 1 or a 2.
• Explosive Casting. If all targets of a spell you cast using a Staff as your Spellcasting Focus are more than half the spell's range from you, one creature of your choice that you hit with a spell attack or that fails a saving throw against the spell has the Prone condition.

Source: Frontiers of Eberron, pg. 168