Teach me, expert players of Armored Princess

[impy]

you're not giving up at the first serious obstacle are you?

1) improve your magic resistance. majority of his units are ranged magic dealers so if you put on chaos helm, magician cloak etc. they'll do only negligible damage.
2) improve your physical resistance. His geyser is physically based.
3) dump level 5 creatures. facing those many,many geysers you do not want to spend tons of mana on time back. Replace temporarily or permanently with unit with god resistances - knight, horseman..
4) better artefacts. I remember seeing those fire protection boots, shark tooth.. which are not helpful in this fight.
5) This is one very nasty fight where you either have to wait until he spends all his mana before you start resurrecting or leave last unit - dragonflies and cast fear. So you are actually quite lucky with him having dragonflies. Cast fear on them in the first round.
6) Once last creature is standing start resurecting. position all units around paladins in the circle and go. Phantom paladins, repeat.
7) have you improved those skills are was telling you about - mana acc., summoner? You can improve your resurrection also by - higher intelellect, increases strength of summoning spell, inquisitors blade, increases number of paladins you can have