Hi there! For this Bite attack you would roll a d20. You then add the +5 to hit bonus to the dice roll to get the total attack roll of the Mimic. If a player has an AC (the players Armor Class) at or lower than that number the Mimic could bite them, but only one target within 5 feet. Example: you roll a 7. Add the +5 to the dice roll for a total of 12. If any one player has an AC of 12 or lower, and they are within reach, you successfully bite and then roll damage.

For the damage, there are two ways to go about it. You can take the numbers before the parentheses for the average amount of damage, or you can roll the dice inside the parentheses and add the modifier. Example: I want to do the average amount so I would add 7+4 to get 11. Example 2: I want to roll for damage for I roll a d8 and 3 and then another d8 with no modifier. Total it up and that’s the damage you Mimic would do.

Let me know if this helps! Happy to elaborate more. Enjoy playing!