# \#1: Don't reveal your villains' names.

The [spell][1] states (emphasis mine):

> When you cast this spell, you can speak the name of a specific creature **(a pseudonym, title, or nickname doesn't work)**.

A villain who is aware of the Gate spell would not tell his name to others. Hence, your players cannot summon him, if they only know him as "evil wizard of the east" or "the hero of Parnast" (yes, that guy is a villain, no further discussion necessary).

# \#2: Use [Contingency][2] with [Otiluke's Resilient Sphere][3].

You can also cast the [Contingency][2] spell on yourself, using "when someone other than me teleports me" as a trigger, and make the spell trigger an [Otiluke's Resilient Sphere][3].

Note that this sphere can be dispelled or destroyed with Disintegrate, so it won't work if your PCs anticipate the use of this sphere.

# \#3: Have an active [Clone][4] residing in an area protected against teleportation and planar travel.

The clone spell allows you to grow an "inert duplicate" of yourself. If / once you die, your soul transfer to this clone, allowing you to "respawn".

If you put your clone on a [Demiplane][5] affected by a permanent [Forbiddance][6] spell (i.e. you have to cast the spell there 30 days in a row), then you can't be immediately resummoned and killed permanently, either. You don't technically have to put your clone on a Demiplane, but since it's *a lot* harder to travel to a demiplane and kill your clone than it is to travel to a remote castle on the material plane, I highly recommend using a Demiplane.

Note that Forbiddance may prevent you from traveling to your Demiplane. If you leave a small part of your Demiplane unaffected by Forbiddance, it shouldn't be an issue, though.

# \#4: Use Wish (duh) to become immune to Gate.

Note that this is up to the DM, but since you *are* the DM, it shouldn't be an issue. Either way, the Wish spell states as one of its more advanced effects:

> You grant up to ten creatures you can see immunity to a single spell or other magical effect for 8 hours. For instance, you could make yourself and all your companions immune to a lich's life drain attack.

You're gonna want this to be permanent, obviously. One could definitely argue whether or not you can make one creature permanently immune to a spell instead of 10 people for 8 hours. However, I personally think it's a valid choice, especially seeing how creatures such as a Helmed Horror also have a permanent immunity to certain spells (albeit none as powerful as Gate).


  [1]: https://www.dndbeyond.com/spells/gate
  [2]: https://www.dndbeyond.com/spells/contingency
  [3]: https://www.dndbeyond.com/spells/resilient-sphere
  [4]: https://www.dndbeyond.com/spells/clone
  [5]: https://www.dndbeyond.com/spells/demiplane
  [6]: https://www.dndbeyond.com/spells/forbiddance