I honestly have no idea what to put here.

Predator

When you choose this subclass at 3rd level, you get the ability to steal the traits of other creatures. As an action on your turn, you can summon a small 5ft cube vortex directly in front of you. Any creature caught in the vortex must make a dexterity or constitution saving throw (your choice) against your spell save DC, on a failed save, the creature takes 1d6 + your spell-casting modifier force damage, on a successful save, the creature takes no damage. If a creature dies from the damage of this attack, and is of CR 1 or lower, you may take a single trait from that creature, if the DM agrees that it makes sense for your character and level. You can use this feature an equal amount of times to your ranger level per long rest.

You can have two of your obtained traits activated at one time, and you can switch out what ones your currently using during a long rest.

Devourer

At 7th level, you have become more adept at stealing traits, granting you the following benefits:

Vortex. Your predator ability has a range of 10ft ahead of you.

Damage. The damage of your vortex increases to 2d6 + your spell-casting mod. In addition, if a creature fails the saving throw, they take half damage, this damage cannot lower the creature below 1 hp.

Alteration. You can now use four different traits at once, and when you gain a new trait you can choose to immediately swap it for another ability you are currently using.

Thief. You can steal traits of creatures CR 3 or lower.

Gluttony

At 11th level you can combine the abilities of Predator and Devour, granting you the following traits:

Vortex. When using your vortex, you can choose to use it normally, or you can cast it in a 5ft cube in line of sight within 30ft of you.

Damage. The damage of you vortex increases to 3d6 + your spellcasting mod, and you can choose whether to deal necrotic or force.

Alteration. You can have six traits in use at once.

Thief. You can now absorb the traits of creatures up to CR 5.

Spell Steal

At 11th level, your connection to the monsters around you has given you enhanced reaction time. When a creature in line of sight within 30ft casts a spell of 3rd level or lower, you can use the reaction to attempt to steal the spell. When you choose to do this, the creature must make a wisdom saving throw, on a failed save, the creatures spell is canceled, and you can choose to instantly cast the spell as if you were casting it, without using a spell slot. You can use this trait successfully once per long rest.

Beelzebub

At 15th level, you finally mastered the traits of creatures around you, and can you them to their full potential.

Vortex. When you use your vortex normally, it's range extends out to 20ft, and when using it with range, the range becomes 60ft, if you hit a creature with your vortex, you can choose to pull them up to 20ft towards you.

Damage. The damage of your vortex becomes 4d6 + spell attack bonus on a fail, and half that on a success, even if a creature succeeds their saving throw, they can still be killed by the attack.

Alteration. You can have up to 8 traits at once, and you can switch them out at a short rest.

Thief. You can now steal the traits of creatures with CR 8 or lower.

Absorb. You can use your spell stealer ability on spell of level five or lower, and it can be used an equal amount of time to your proficiency bonus halved (rounded down).