"Might vs. Magic"

Used antimagic on the skeletons – it’s great, but that damn elixir…

Antimagic is clearly not the right choice here, especially against skeletons. They already have a lot of hit points.

Plus, then a counter-antimagic spell could be cast on the archers, which would be even worse.

There are also options with a protective field at the gate; when it’s dispelled, the antimagic will also be removed.

It would be good if there was a teleport spell, then the skeletons could start attacking the defenders and archers from the first round.