Protector of sigil

You have been chosen by the lady of pain. You looked at her while in Sigil one day to for her to stare back. She looked at you; stared, and continued. You remained unharmed. From that moment you understood, almost inherently,  that you had been provided a task simple in its explanation but difficult in its execution: protect Sigil; prevent the fall of Sigil. You have been provided incredible power from the city itself to complete this task. The Lady of Pain is watching. If the city shall fall then so shall you.

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Extended spell list

1st level spells: Alarm & Hunter's Mark

2nd level spells: Arcane lock & vortex warp

3rd level spells: Blink & Nondetection

4th level spells: Banishment & dimension door

5th level spells: steel wind strike temporal shunt

9th: Gate

 

Spacail manpulation

Starting at 1st level, you have found a way to create temporary gateways. These gateways can be opened from the slight excess energy of your magic. You have the ability to use touch range spells at further distances by extending your arm through these gateways. When you use a spell with a range of touch you can extend the range of the spell by 15 ft as a reaction. The range of this ability doubles at level 10. You can use this feature a number of times equal to half your warlock level rounded up. Once you use all uses of this feature you can not do so again till you take a long rest. 

In addition to this, the cost of magic rooted in teleportation, gateways, and portals requires half the materials (for the purpose of cost). It is up to your DM to determine what spells this does not apply to. 

Spaces between

Starting at 6th level, you can use your bonus action to teleport up to 30 feet to an unoccupied space that you can see. Alternatively, you can choose a space within range that is occupied by a Small or Medium creature. If that creature is willing, you both teleport, swapping places.

Once you use this feature, you can't use it again until you finish a long rest, a short rest, or cast a spell of 1st level or higher related to gates, portals, or teleportation (DM determines if the spell fits the requirement), or if an eldritch invocation that uses teleportation is used.

Uncontainable

Starting at 10th level, you are unaffected by magical effects that would result in moving via teleportation if it is against your will. In addition, any charisma checks and probability instances made to see if the means of your teleportation are successful are made with advantage. 

Permant residance

You have a deep underlying connection with the city of Sigil. You can cast the plane shift spell to transport to Sigil. Casting this spell with this feature removes material comment requirements and be cast without the consumption of a spell slot. Once this feature has been used it can not be used again for another 1d4-1 days.