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Using Battlescribe I ran into a small mistake and something that made me unsure about the cost of an upgrade option.

Noticed that for the plague drones the chaos icon costs 15 points instead of 10 as most other units.

However I also noticed that in battlescribe the upgrade to a plague banner was a simple +10 to the cost.

Now just to be sure I read the codex as that it costs 15 to get the icon and another 25 points to upgrade to a plague banner, so a total of 40 points for a plague banner for the plague drones (which to me sounds a bit steep even though this is how I read the codex.)

Or is the way that whomever made the datafile for daemon dex in bs intended as a total cost of 25 points for a plague banner?

It would be 40 pts total. This is why I don't use catalogues made by other people.