Yeah, it's an absolutely great sword.

I've been using it recently with a fighter of mine, and if the enemy has no magic resistance he can clock up over 250hp while using
Greater Whirlwind. Obviously, this makes him ultra resilient in a slog-athon.
Of course they all disappear a few rounds after the fight but by then the enemy is a bloody mess on the floor anyway.
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"Our deepest fear is not that we are inadequate.
Our deepest fear is that we are powerful beyond measure."