Need help first boss Giant Spider (impo)

[hatuan1983]

I'm playing Viking in Imposible.
Everything's alright till the first boss. Already 110 no losss.
Kill almost 98% monster on first 4 island.
But the boss is so hard, 34k hp, counter attack everytime u hit.
I have only 37 mana to heal (order lv 3), so cant hit and heal with Jotun (can only 37 times, but jotun do only 400 dmg a time) .
If i use mass unit to attak at once, boss can attack many unit at a time. So cant last long.

Any idea, to fight this boss with Viking class ?

I'm trying low cost units like berserkers, blue snake, polar bear,jotun, jarl.
I dont care about no loss, just to kill it by any means