Mimicry: The raven can mimic simple sounds it has heard, such as a person whispering, a baby crying, or an animal chittering. A creature that hears the sounds can tell they are imitations with a successful DC 10 Wisdom (Insight) check.
Share protections: The clockwork familiar is linked to the clockwork master. As long as it is within 5’ of its master it receives all his resistances and adds the master’s proficiency bonus to any attacks, skill checks, ability checks, or saves made.
Hardy Construction: The clockwork familiar hit dice total is increased by 4, and the creatures HP becomes the max roll for each. Example: Raven have HP 1 (1d4-1) normally. A clockwork raven becomes HP 15 (5d4-5)
Upgrade Slots: A clockwork familiar has a limited number of slots available for upgrades. Each major upgrade takes up 2 slots and each minor upgrade takes up 1. The number of slots is dependent on the creatures size.
Minor Upgrades:
Enhanced Senses: The clockwork familiar gains advantage on all perception checks.
Speech: The clockwork familiar can speak one language that the master knows.
Major Upgrades:
Defensive Increase: Armoring the clockwork familiar gives it a +4 bonus to its AC and its hit die increases by 1 category (d4 to d6, etc). This can be taken multiple times.
Beak. Melee Weapon Attack: +4 to hit, reach 5 ft., one target. Hit: 1 piercing damage.