I see people mentioning a "one drop" or "two drop" list, etc. What does this mean? I'm new and not up on the lingo.
During set up you take turns with your opponent to set units on the table, or "drop" them. If you have a "one drop" army they units are all able to be fielded at once. This is accomplished by the fact that batallions can be placed in their entirety if you so choose. One drops for Seraphon are normally based on Soteks Fang or Dracothions Tail, both from GHB 2018.
And obviously, being able to finish before your opponent, lets you decide who will take the first round at the beginning of the game. It's more powerful than the mechanic of 40k, where the first to finish deployment got "only" a +1 to the roll to see who goes first.
I don't like this rule very much, but given the 1-drop choices for Seraphon I'm sure our scaly predators find it very tasty.
Remember too that "1 drop" lists don't have to be one drop. From what I understand (and someone please correct me if i'm wrong) you can place as much of the battalion as you want on any given drop. So if you know the opponent has 5 drops, you could have 4 and really have the deployment advantage against your opponent. Not only would you get the first turn, but you don't have to worry as much about your opponent already knowing where everything in your army is deployed.
Indeed, that is one very powerful strategy more often than not forgotten, as it is such a tiny detail that can make a huge difference!