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Yes, the defenders are cool and resilient guys! And the riders are pretty good too!
New here? I'm Roha — want a quick tour?

It's better to just hit them with a fireball than to do all this complicated stuff, although the wall is a good thing...
You're right, it's best to apply the Fire Sign by level 6, and even earlier if possible...
Regarding the combination of walls with bears and harpooners... No decent player will exit the wall in a way that allows bears or harpooners to push them back... And bears sometimes deal negative damage, you run to block archers, and they push them directly into the archers' line of fire.
Yarls are undoubtedly the best! Rune of Battle Rage + Yarls = 3-4 chains of lightning against most opponents (with repeated turns, you can apply 2 runes simultaneously, for example, Dragon Rune + Rune of Battle Rage). Of course, if you're lucky enough to get these runes! Inga knows most of the runes by level 25 and above.
Kshatriya Rakshasa now leaves no chance for anyone; I'm for them!
The most balanced melee unit, perfect for mages.