What are the odds?

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If you add all the buffs together (Berserk, Heroism, Bless), you get +32 (internally +96) to_hit bonus. This would take a DL 50 warrior (~300 internal to_hit, and +150 bonus) from 450 to_hit to 542. Against Sauron, this corresponds to a 5% absolute increase in hit probability (74% to 79%) vs. Morgoth, or an effective damage increase of 7%. Against Sauron, it's +6% absolute hit probability and +9% relative damage.

For a priest (or Mage) in combat or with archery, the difference is much, much higher. I always felt Mage really should get Heroism at dl 40 or so, just as a convenience. (At that level, I am nearly always using a ton of archery, and end up with inventory management problems from carrying buffs.)

Oh, I did not know it, completely ignored these spells... Thanks Pete!