This 5e (2024) version is a homebrewed conversion built for this site. Ability scores and general concept carried over directly; AC, HP, and the bite attack were rebuilt from scratch using 5e's monster math rather than pulled from any published stat block, since 5e values monsters very differently than 3.5e's CR system did. Shadow Blend and Bay are kept as reflavored 5e traits; the Master Link (empathic link, spell delivery, spell resistance) is preserved as a familiar-bond feature tied to Bob rather than an innate trait of the creature itself.
Ability Scores
Ability
Score
Modifier
Strength (STR)
17
+3
Dexterity (DEX)
15
+2
Constitution (CON)
17
+3
Intelligence (INT)
9
-1
Wisdom (WIS)
13
+1
Charisma (CHA)
13
+1
Combat & Vitals
Hit Points
39 HP (6d8+12)
Armor Class
14 (Natural Armor)
Speed
50 ft.
Challenge Rating
2 (approx., homebrew)
Bite Attack
+5 to hit, 1d8+3 piercing
Skills
Perception +3, Stealth +6
Traits & Actions
Shadow Blend: While in dim light or darkness, the mastiff can take the Hide action as a bonus action.
Sunlight Sensitivity: Disadvantage on attack rolls and Perception checks that rely on sight while in direct sunlight.
Bay (Recharge 5–6): Each creature within 30 feet that can hear the howl must succeed on a DC 13 Wisdom saving throw or be frightened until the end of its next turn.
Bite (Action): Melee Weapon Attack: +5 to hit, reach 5 ft., one target. Hit: 1d8+3 piercing damage; the target must succeed on a DC 13 Strength save or be knocked prone.
Master Link: Shares an empathic link with Bob Ravenson within 1 mile; Bob can deliver touch spells through the mastiff as an action.