Homebrew Ancient rock golem (Nonliving) [protecter] Species Details

A huge ancient rock golem a magical item was used in the making of it,  after many many centuries the magical item activated making the ancient golem wake up and taking the last comand from his dead creator "protect the humanity"

His speed is 15ft at lvl one and every lvl he gets 5 more except at lvl (9) he gets 10 more, because every lvl the magical item that works as its brain scans data from the humans around him and compresses the rocks to make it look more like a human and with that he gets faster, there for with the compressing of the rocks the golem gets smaller and smaller till he gets to the size of an average human (caped at 60 ft) (at lvl 3 you be a large size golem, at lvl 6 you be a big medium [2.5mt], at lvl 9 you become medium sized [1.8 -- 2]mt)

+4str +2 con, your ac is 14+ Con, 

Your creature type is construct instead of humanoid. As such, spells like cure wounds don't affect you, and you are immune to spells like crown of madness or dominate person because they specifically target humanoids. You are immune to poison damage, being poisoned, and diseases. You do not need to eat or breathe, and any food you do attempt to eat falls through the space where your head would be .Rather than sleeping, you enter an inactive state for 6 hours each day. You do not dream in this state; you are fully aware of your surroundings and notice approaching enemies and other events as normal

Mendable. Nonliving as you are, you can be repaired like an object. When the mending spell is cast on you, it has the following alterations: It has a casting time of 1 action. If you have 0 hit points you become stable. As part of the casting of mending the caster may expend any level of spell slot to cause you to regain a number of hit points equal to 1d8, plus their spellcasting ability modifier. For each level of the spell slot expended you regain an additional 1d8 hit points.

you are immune to charm

You have a purpose from which you must not deviate, and nothing can make you go against this purpose.

You are made to fight alongside others. Your fists are natural weapons to pummel with unarmed strikes. If you hit with them, you deal bludgeoning damage equal to 1d6 + your Strength modifier. Additionally, you are proficient in the Athletics skill. you fail Stealth and Sleight of hand

Ancient rock golem (Nonliving) [protecter] Traits

+4str +2 con, Constructed Resilience, Sentry’s Rest, proficient in Athletics