Can a good lich use a phylactery? So a wizard who protects the land is dying, his only recourse is to extend his existence. As alignment is becoming a non-thing, I don't see the issue with the P as not all liches are evil. Plus it is s very cool sounding word
Looking at the 5e description of the lich here:
No wizard takes up the path to lichdom on a whim, and the process of becoming a lich is a well-guarded secret. Wizards that seek lichdom must make bargains with fiends, evil gods, or other foul entities. Many turn to Orcus, Demon Prince of Undeath, whose power has created countless liches. However, those that control the power of lichdom always demand fealty and service for their knowledge.
[...]
With its phylactery prepared, the future lich drinks a potion of transformation — a vile concoction of poison mixed with the blood of a sentient creature whose soul is sacrificed to the phylactery.
[...]
A lich must periodically feed souls to its phylactery to sustain the magic preserving its body and consciousness.
A lich has to bargain with the foulest of creatures and then murder sentient creatures to first become a lich, and then periodically to remain one. I would argue that a good lich is an impossibility*. Even if you would be able to do some moral calculus arguing that one soul every so often is "worth it", the process of becoming a lich would itself warp the wizard's mind to the point where they
become evil. A good wizard in the situation you describe should instead seek a more sustainable method, such as training/recruiting replacements.
* I know previous editions have had archliches and baelnorns as "good liches", but I consider those to be supremely bad ideas and thus reject them entirely.