Your strength or dexterity score increases by 2 and your constitution increases by 1.

Your maximum lifespan remains the same as that of a normal Drow, however, most Drow are transformed into Driders well into their adulthood.

Most Spyderlings are well over 6 feet tall, and some can be as mush as over 7 feet tall. Your size is medium.

Your base walking speed is 30 feet.

You can see in dim light within 90 feet of you as if it were bright light, and in darkness as if it were dim light. You can’t discern color in darkness, only shades of gray. 

You can read, write and speak common, undercommon and elvish.

Your body has been gravely disfigured with horrific mutations. As your power grows, so does your curse, rooting itself deeper into your physical form. Choose one mutation from the Divine Curse list at 1st level and one at 5th level.

• Blight Carrier (1st level). Your body has developed an excess of lethal toxins that you can use to coat your weapons in.  As an action, you can coat your weapon in a venom that lasts for 1 minute and causes the weapon to deal additional poison damage equal to 1d6 + your constitution modifier. The target must succeed on a DC 13 constitution saving throw or be poisoned for the amount of time the poison would have last (ex: a weapon is envenomed, and a target is hit with it 3 rounds later, before failing their saving throw. They are now poisoned for the next 7 rounds of combat.)
• False Head (1st level). Your spider-like abdomen has grown a false spider head, which produces a venom that targets a creature's brain. This appendage acts as a natural weapon that enhances your unarmed strikes. When you hit with an unarmed strike it does an additional 1d4 poison damage, and the target must succeed on a DC 13 intelligence saving throw or have disadvantage on all attack rolls made against you until the end of your next turn. 
• Killer Instinct (1st level).  Your instincts have been sharpened by your transformation and you have become a highly adaptable warrior. You gain proficiency in either one weapon, one type of armor or shields. 
• Arachnid Speed (5th level). Your arachnid legs are much larger and more powerful. Your walking speed increases by 10 feet, and you gain a climb speed equal to half of your walking speed.
• Chitinous Juggernaut (5th level). Your abdomen is coated in a bulky chitin. You count as one size larger when determining your carrying capacity and weight you can push, drag or lift and you gain a +1 to your AC when you are not wearing heavy armor. 
• Predator Sense (5th level). You have a keen awareness of nearby creatures and can track your prey with deadly efficiency. You gain proficiency in either perception, survival or investigation, your darkvision has a range of 120 feet instead of 90 and you have advantage on ability checks made to track creatures.