Thank you all for the responses, and to Cevah in particular for breaking down the feat for me. I joined a CotCT campaign after a long hiatus from Pathfinder, and I'm definitely a little rusty. My character is actually using Words of Power from Ultimate Magic (Corrosive Bolt specifically), and I figured asking asking about Acid Arrow would tell me what I needed to know. So far the character has been a...blast to play. (I'm so sorry.)
