Thunder and Fang | EN World Tabletop RPG News & Reviews
According to the Thunder and Fang, the character needs to weapon focus on both weapons and have twf as prereqs.If you look under TWF:
Circumstances Primary Hand Off Hand
Normal penalties –6 –10
Off-hand weapon is light –4 –8
Two-Weapon Fighting feat –4 –4
Off-hand weapon is light and Two-Weapon Fighting feat –2 –2
Now let's look to weapon focus which is part of the requirement. She would gain a +1 attack bonus to each weapon for having this effectively making it -1 primary and -1 off hand. Then you add in the -2 for the Earth Breaker being a 2h weapon and being used as a 1h weapon as you pointed out. In the end she gets -3 primary hand and -1 off hand when you factor in the feats and prereqs needed.
I don't see any problems with this as long as the prerequisites are met. I certainly don't see it as being absurd especially in a fantasy setting.
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