Mastiff (Warrior Sidekick) subclass

Converting the Warrior sidekick to a playable character

Second Wind

The sidekick can use a bonus action on its turn to regain hit points equal to 1d10 + its level in this class. Once it uses this feature, it must finish a short or long rest before it can use it again.

The sidekick can use this feature twice between rests starting at 20th level.

ASI @ 14

ASI @ 14, as prescribed for Warrior Sidekicks in TCoE.

Extra Attack @ LVL6

The sidekick can attack twice, instead of once, whenever it takes the Attack action on its turn.

The number of attacks increases to three when the sidekick reaches 15th level.

Improved Defense

The sidekick’s Armor Class increases by 1.

+2 HP per level, class

+2 HP per level. Corrects for the discrepancy between the unfortunate but necessary low HD of the Wizard class and the far-more-appropriate HD of the actual Mastiff stat block.