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

Web Sense. While in contact with a web, the spider knows the exact location of any other creature in contact with the same web.

Web Walker. The spider ignores movement restrictions caused by webbing.

Can be Turned:  Yes.

Upon Death:  Dissolves into dust leaving only two fangs.  A fang (generally spiders have two) can be used to replace a single M requirement for a Necromancy spell (if the spell has two components you can use 2 fangs but you cannot use more fangs than separate spell components).  It also adds +1 to the effect of the spell (ex HP recover or damage (+1 for the whole roll, not per die)) per fang used.

Bite. Melee Weapon Attack: +4 to hit, reach 5 ft., one creature. Hit: 1 piercing damage, and the target must succeed on a DC 10 Constitution saving throw or take 1 [rollable](1d4)); Strength Drain

{"diceNotation":"1d4","rollType":"damage","rollAction":"Bite","rollDamageType":"poison"}[/rollable] poison damage.

1 Strength can be recovered with a short rest or all strength with a long rest

A character dropped to 0 HP will begin dying in the normal mode, this character will still be seen as alive to the spiders so any spider will continue attacking that character and the character will continue making con saving throws.

A living creature dropped to 0 Str dies and comes back as a Zombie in 1d6 rounds.