Bushido Page on Wiki does not have WW damage bonus listed
Whirlwind + bushido gives a damage multiplier bonus based on number of enemies aggroed and in range. I don't have the numbers at hand, but I think it is 100 bonus with 4 enemies or more at 120 bushido. https://uo.com/wiki/ultima-online-wiki/skills/bushido/
Comments
Requires Bushido or Ninjitsu skill.
That would not be correct for Whirlwind + Bushido damage.
https://www.uo-cah.com/magic-abilities/bushido
This is more clear, from uo-cah.com Your Bushido skill will increase the damage of Whirlwind Attack based on its skill level and the number of opponents you hit. This bonus caps out at 100 bonus damage (at 120 Bushido and 5 enemies). But lacks detail of how it scales by skill / enemy count.
This is a much more accurate description from stratics:
https://uo2.stratics.com/skill-guides/skills-and-professions/bushido/the-samurai/
Whirlwind : ((# of opponents * Bushido) * (# of opponents * Bushido) / 3600) = Bonus Damage
Note: Damage Bonus for Whirlwind caps at 100. Also, Bushido counts as a weapon skill towards the reduction of the mana cost of weapon specific moves and abilities.
Example: If you are using a weapon with Whirlwind on it, and you are surrounded by 4 enemies, and have a Bushido skill of 90, the additional damage you do to each of those enemies will be 36 points of additional damage.
Usefulness:
Though this move is dependent on how many mobs are near you, go someplace, say Doom and fight renderer’s with a fire or cold damage based weapon (or consecrate weapon if you are a paladin samurai) and just watch the damage climb and climb from that alone. Jump in the middle of a bunch of spawn and whirlwind once and watch how fast the mobs drop; it almost feels like a requirement to have Whirlwind based weapons.
The whole page contains useful nuts and bolts information. It would be nice to have that kind of detail on the wiki.
frenzied whirlwind does not receive that bonus damage.