The UA Ranger's wolf companion
To answer your questions:
"The average of 2d8 should be 10. 10+2 is 12." This explanation by kriivi via a comment is better than my original attempt, so I'm going to quote it here:
Expected value is linear, which means that the sum of individual die values will do. In the case of d8, the expected value (or more intuitively,...
The average (expected value) of 2d8 is 9, not 10.
The rules for monsters and PC-s are separate. There is no such thing as a level 1 wolf (unless you awaken it to sentience and it gains a PC level). You are correct that its hit die is a d8.
To me it seems that either they miscalculated or are using different rules than you are (...
Hunt Prey takes a single action, as can be seen from the symbol next to the name. The rules text does not specify any limitations on how often the ability can be used, so you can designate targets as often as you like, provided you're willing to spend a single action each time.
You can only choose one additional creature type or one additional humanoid at later levels
Largely just to present an alternative take to the one presented by the most upvoted answer, if we focus on the terms used, it says:
Choose a type of favored enemy: aberrations, beasts, celestials, constructs, dragons, elementals, fey, fiends, giants, ...
Your best bet is probably a Monster Slayer using a Hand Crossbow, with the Crossbow Expert and Sharpshooter feats
I'll start by pointing out that I don't think that "assuming attacks hit" is an especially effective way to gauge character damage output. Many methods of producing damage, like the Sharpshooter and Great Weapon Master feats, specifically ...
301.5 damage total, 55.5 damage on most rounds
Given that we assume all attacks hit, any serious attempt must include either Great Weapon Master + Polearm Master or Sharpshooter + Crossbow Expert so at to maximize the number of attacks and the damage on a hit.
None of the many reasons we might favor the SS+CE over GWM+PM (Archery Fighting ...
While the rules as written state that you must pick a single beast as an animal companion, I would ask your DM.
The Monster Manual does have a stat block, causing it to function as a single entity, and the stat block does meet all other qualifications for being an animal companion. While you would be unable to heal the swarm with spells, you would be able ...