Tip for grinding the 1k kill medal:
Get mana & hp leeching stuff, especially mana, then learn and level up the thunder spell.
Put all points in intelligence and your thunder spell will basically hit like 5x more than your weapon, but hit all enemies around you and barely cost any mana as you will regenerate it quickly with the leeching.
If you have like 5% mana steal total and got your intelligence to 300+ you will have 3000+ mana and get like 150 back with each hit, while only spending around 15 to cast the spell, so you can spam it constantly while running through enemy hordes, refilling it almost instantly each time.
Then just use the remaining armor for high defence and exp gain to become a grinding thunder god tank.