For those having problems with the Turtle Boss, I modified a tactic from this link:
http://forum.1cpublishing.eu/showthr...t=16499&page=2
Just replace the Knight with a full stack of Druids; see screenshot below. This is a guaranteed no-loss win in around 30 turns (not too long), and you don't even need to cast a single spell from your spellbook. Tactic has been tested on Impossible Paladin game.
For those having problems with the Spider Boss, see 2nd screenshot below. You are not guaranteed to have all the components for a sure win. Druids and Archmages are always there; same with the Repair Droids (dwarves unlocked after the 1st boss battle). What is not guaranteed is the Phantom spell that I kept casting on the Repair Droids to keep it at full stack. Also not guaranteed are the Demonologists. I'm just showing a way of making the best of what you've got. This battle lasted 30 turns as well, btw.
Honestly, if you really want to have a guaranteed win against the Spider boss as the second battle (3rd if you count the single assassin battle) then just restart the game till you get "killer" units from Klissan, the tavern, or the School of Gloom (and you could check these quickly even without using the KBScanner); I've seen these shops spawn ancient vampires, ents, and royal thorns.
After the spider boss battle you get to unlock the elves... royal thorns, thorn-hunters/thorn warriors, ents, ancient ents + Hagrid = game over.
Crown of Blackthorne always seem to spawn, btw; it's only the location that seems randomized.