yeah se thats the problem everything thats happening is big stuff something you expect to se in a high level campaign not when you start at level one yeah sure it playable but still makes no sense. An vampire spawn in DnD are much more powerful then an plain human so i cant se why they thought it would be a good ide.

Its nothing wrong about playing powerful or epic campaings but then you ussually start at higher level or atleast everyone is a special class/race or having powerful artifacts.
Here they just gave him a Vampire template cause its cool.
Then for no reason takes away most vampire powers so he doesnt outpower the rest thats what im having problem with thats why the 10yo remark.
so far we know that sunlight and eter home is gone and apperentliy spider climb and regen. Running water dmg is reduced.

Regeneration: The Vampire regains 10 Hit Points at the start of its turn if it has at least 1 hit point and isn't in sunlight or running water. If the Vampire takes radiant damage or damage from Holy Water, this trait doesn't function at the start of the vampire's next turn.

Spider Climb: The Vampire can climb difficult surfaces, including upside down on ceilings, without needing to make an ability check.

Vampire Weaknesses: The Vampire has the following flaws:
Forbiddance. The Vampire can't enter a Residence without an invitation from one of the occupants.
Harmed by Running Water. The Vampire takes 20 acid damage when it ends its turn in running water.
Stake to the Heart. The Vampire is destroyed if a piercing weapon made of wood is driven into its heart while it is Incapacitated in its Resting place.
Sunlight Hypersensitivity. The Vampire takes 20 radiant damage when it starts its turn in sunlight. While in sunlight, it has disadvantage on Attack Rolls and Ability Checks.

I... live! Flesh and blood and bone! I am alive! Ha-ha! I swore I would scratch and crawl my way back into the world of the living... and I have done it!