Getting past the bloody spider.

[Lancian]

I did this as Soothsayer without trolls using Jarls, Warrior Maidens, Royal Snakes, Polar Bears and Swap Snakes. I found I can buy trolls at the map AFTER I killed the spider (the dwelling is not shown on map). The idea is try not to melee spider much with any other units than Jarls and Bears. Snakes and maidens should clear spiders, while using ranged/bite attack on boss when its ready. Use protection spells on jarls and bears and offensive on the boss. You will kill him eventually, but if you aim for some achievements or dont want to lose many units (as you will), use the trolls and profit.