As a side note, there was a version of sangband which had an off-by-a-factor-of-ten bug in throwing, I think -- maybe you are using that version (I'm not sure when this was, but it was somewhat recent, b18?). That might be a contributing factor.
Also, note that throwing provides a multiplier ranging between 1 to 10, I think, depending on your skill and what you are throwing. Add in a multiplier with a fixed bonus, and kablooie.
If you want a fixed bonus (and I'm not sure you should), make sure it gets added at the same place as the bonus for slays.
Also, I'm a bit confused -- I think deadliness affects the number of sides on the dice, so I'm not quite sure what you put together.
Oh, and 400 damage is a nice amount for a single dagger throw :)
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Also, note that throwing provides a multiplier ranging between 1 to 10, I think, depending on your skill and what you are throwing. Add in a multiplier with a fixed bonus, and kablooie.
If you want a fixed bonus (and I'm not sure you should), make sure it gets added at the same place as the bonus for slays.
Also, I'm a bit confused -- I think deadliness affects the number of sides on the dice, so I'm not quite sure what you put together.
Oh, and 400 damage is a nice amount for a single dagger throw :)