The Investment of the Chain Master Eldritch Invocation states:

[...] When you cast find familiar, you infuse the summoned familiar with a measure of your eldritch power, granting the creature the following benefits: [...]

[...] * If the familiar forces a creature to make a saving throw, it uses your spell save DC. [...]

My question is, if the warlock has a Rod of the Pact Keeper, or something else which raises their saving throw DC, does the familiar inherit this when it triggers a saving throw? For example: If I had a DC 14 save with no gear and a DC 15 save with my +1 magic item, would the familiar use a 14 or a 15 for its save DC?

Thank you very much commenters. I removed wand of the war mage since it definitely will not affect this

The Investment of the Chain Master Eldritch Invocation states:

[...] When you cast find familiar, you infuse the summoned familiar with a measure of your eldritch power, granting the creature the following benefits: [...]

[...] * If the familiar forces a creature to make a saving throw, it uses your spell save DC. [...]

My question is, if the warlock has a Rod of the Pact Keeper, or something else which raises their saving throw DC, does the familiar inherit this when it triggers a saving throw? For example: If I had a DC 14 save with no gear and a DC 15 save with my +1 magic item, would the familiar use a 14 or a 15 for its save DC?

The Investment of the Chain Master Eldritch Invocation states:

[...] When you cast find familiar, you infuse the summoned familiar with a measure of your eldritch power, granting the creature the following benefits: [...]

[...] * If the familiar forces a creature to make a saving throw, it uses your spell save DC. [...]

My question is, if the warlock has a Rod of the Pact Keeper, or Wand of the War Mage or something else which raises their saving throw DC, does the familiar inherit this when it triggers a saving throw? For example: If I had a DC 14 save with no gear and a DC 15 save with my +1 magic item, would the familiar use a 14 or a 15 for its save DC?

The Investment of the Chain Master Eldritch Invocation states:

[...] When you cast find familiar, you infuse the summoned familiar with a measure of your eldritch power, granting the creature the following benefits: [...]

[...] * If the familiar forces a creature to make a saving throw, it uses your spell save DC. [...]

My question is, if the warlock has a Rod of the Pact Keeper, or something else which raises their saving throw DC, does the familiar inherit this when it triggers a saving throw? For example: If I had a DC 14 save with no gear and a DC 15 save with my +1 magic item, would the familiar use a 14 or a 15 for its save DC?

Thank you very much commenters. I removed wand of the war mage since it definitely will not affect this

Investment of the Chain Master

Prerequisite: Pact of the Chain feature

When you cast find familiar, you infuse the summoned familiar with a measure of your eldritch power, granting the creature the following benefits: he familiar gains either a flying speed or a swimming speed (your choice) of 40 feet.

As a bonus action, you can command the familiar to take the Attack action.

The familiar’s weapon attacks are considered magical for the purpose of overcoming immunity and resistance to nonmagical attacks.

If the familiar forces a creature to make a saving throw, it uses your spell save DC.

When the familiar takes damage, you can use your reaction to grant it resistance against that damage.

The question is, if the warlock has a rod of the pact keeper, or wand of the war mage or something else which raises their save DC, does the Familiar inherit this when its (usually poison) attack triggers a saving throw? If I had a dc 14 save with no gear and a dc 15 save with my +1 magic item, would the familiar use a 14 or a 15 for its save dc?

The Investment of the Chain Master Eldritch Invocation states:

[...] When you cast find familiar, you infuse the summoned familiar with a measure of your eldritch power, granting the creature the following benefits: [...]

[...] * If the familiar forces a creature to make a saving throw, it uses your spell save DC. [...]

My question is, if the warlock has a Rod of the Pact Keeper, or Wand of the War Mage or something else which raises their saving throw DC, does the familiar inherit this when it triggers a saving throw? For example: If I had a DC 14 save with no gear and a DC 15 save with my +1 magic item, would the familiar use a 14 or a 15 for its save DC?