Additional info to what Blitz says: If you can swarm the Ettin with lots of Peasants, The Ettin will suffer from a super slow effect, almost a stun lock!. Just use Ranger with high Lvl Peasants + Reinforcements + Flash Bomb. =) Learned this easy way from this guide here.
Excellent!, Now I know how much Glu points I need to earn or buy next for every upgrades! =) Love your Part 2 guide too, especially for the Peasants Lvl, been using with this walkthrough guide