First time I battled the spider I thought it was pretty easy.... till I got horribly beaten.
Round 1: Giant Spider summons 300 spiders. I kill them and hit the boss a couple of times.
Round 2: Giant Spider summons another 300 spiders. Again I kill them and hit the boss a couple of times.
A few rounds later he's summoning 800 spiders, and by round 25 he was summoning over 1,000 spiders per round.
On my second try I found it very easy.
I grouped units (mainly archers) together in the middle of the battlefield, and used shaman totems and raise dead to surround them.
When the giant spider summons a bunch of spiders they have low attack, and when can raise dead on them I've got a stack with 20+ defence.
Within a few rounds I'd got a protective ring of totems and spiders around my archers, and I beat the giant spider without a single troop dying.
________
CBR954RR