Fey Ancestry. Zylna has advantage on saving throws against being charmed, and magic can't put Zylna to sleep.

Innate Spellcasting. Zylna innate spellcasting ability is Wisdom (spell save DC 18). Zylna can innately cast the following spells, requiring no material components:

At will: dancing lights, Hunter's Mark, Fog Cloud

3/day each: darkness, faerie fire, Conjure Animals, Conjure Volley

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

Sunlight Sensitivity. While in sunlight, Zylna has disadvantage on attack rolls, as well as on Wisdom (Perception) checks that rely on sight.

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

Sneak Attack. Once per turn, Zylna can deal an extra 5d6 damage to one creature you hit with an attack with a finesse or ranged weapon if Zylna has advantage on the attack roll. Zylna don’t need advantage on the attack roll if another enemy of the target is within 5 ft. of it, that enemy isn’t incapacitated, and Zylna don’t have disadvantage on the attack roll

Defensive Tactics. Opportunity attacks against you are made with disadvantage.

Land’s Stride. Zylna is immune  to difficult terrain

Evasion. When Zylna is subjected to an effect that allows you to make a DEX saving throw to take only half damage, Zylna instead take no damage if you succeed on the saving throw, and only half damage if you fail.

Multiattack. Zylna makes three attacks, either with its Rapier fang or its arachnid-bow. It can replace one of those attacks with a bite attack.

Bite. Melee Weapon Attack: +10 to hit, reach 5 ft., one creature. Hit: 15 (5d4) piercing damage plus 40 (8d8) poison damage.

Rapier fang. Melee Weapon Attack: +14 to hit, reach 5 ft., one target. Hit: 13 (1d8 + 8) piercing damage, plus 20 (4d8) poison damage..

Arachnid-bow. Ranged Weapon Attack: +16 to hit, range 150/600 ft., one target. Hit: 12 (1d6 + 8) piercing damage plus 20 (4d8) poison damage.

 Spider fang blast(Clock of stars Verint) recharge 2-6. auto hits up to 7 targets. Hit: 21(7d4+7) divided between the targets

bonus action

Cunning Action. Zylna can take the Dash, Disengage, or Hide action as a Bonus Action

Web shout. Zylna covers a 20 by 20 cube in her webs the area becomes difficult terrain.

Uncanny Dodge When an attacker that Zylna can see hits Zylna with an attack, Zylna can use her reaction to halve the attack’s damage against her.

The dragon can take 2 legendary actions, choosing from the options below. Only one legendary action option can be used at a time and only at the end of another creature's turn. Zylna Drider regains spent legendary actions at the start of her turn.

Detect. Zylna Drider makes a Wisdom (Perception) check.

Rapier fang. Zylna makes a Rapier fang attack.

Web shout. Zylna makes a Web shout attack.