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Take Runic Harmony, empathy (a scholar and keeper of secrets in education + gathering troops in combat spirit), so you can cast spells faster than the elf (meaning Helmar as the main hero). Take Quick Mind through education (solving secrets) and scouting in logistics, and defense with readiness through the Hirdu defensive skill and resilience. In principle, you can reach level 27 in 3 months if you don't miss a single mob. I won't leave you here either =)
Added 3 minutes later
This is if you're playing as Haven, of course! And in Dungeon, use pyrokinesis and overwhelm them with Armageddon.
Added 3 minutes later
This is if you're playing as Haven, of course! And in Dungeon, use pyrokinesis and overwhelm them with Armageddon.