Thanks, I know that trick - I always get the first stone that way (sometimes I have to reload before entering the catacombs, as the boss droid is not always kite-able.
I got the stone back, but they have only 6 paladins (and I could recruit much more). But no problems - I found 18+5 Horsemen on Rusty Anchor and Scarlet Wind, so they are standing in for the Paladins for now (I can use 12 now). Even got 7 Royal Griffins with a Wind Walker scroll.
I'm doing Bolo now, and it's much easier - my Rune Mage and Royal Griffins spawn summons, Inquisitors/Rune Mages resurrect, and Horsemen and Royal Griffins tank. I use Guardsmen too or Witch Hunters -depending on the enemy troops, sometimes that magic lock comes very handy.
I agree with you about Verona - it is like a sweets-shop for units and items. But, the troops guarding the map are still "lethal" or "very strong" so I'll clean out everyone I can before trying to attack them (and unfortunately, sometimes they are guarding a map I already have).
And yep, Paladins/Royal Griffins rock. On my first walkthrough of AP, I deliberately tried out all the new units first, then went with an all-Lizardmen army when I got to Reha. My initial army was: Trolls, Paladins, Royal Griffins, Guard Droids and Repair Droids.

Never lost a unit with that combo.