Ok, repeated int undead resurrections with potion healing is totally viable.
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The steps to replicate this are as follows:
Phase 0 (preliminary notes:)
This process will involve two controllable characters, Adventurer 1 and Adventurer 2. The resurrection process will depend upon the player's ability to switch between each character as needed. However, it is not necessary to create Adventurer 2 until Phase 1 is complete, as described below.
Phase 1 (preparation:)
1a) Adventurer 1 obtains a healing potion of some sort from a mysterious lair, dungeon, or palace.
1b) Adventurer 1 obtains multiple necromancy secrets -> can raise multiple forms of intelligent undead.
1c) Adventurer 1 obtains a very sharp edged weapon (sword or axe,) and becomes skilled enough in its use to behead low-skill opponents in one blow.
- If you haven't created Adventurer 2 yet, this is a good time to retire Adventurer 1 and start a new game with both characters.
Phase 2 (initial resurrection, re-killing:)
2a) Adventurer 2 enters the scene, as a controllable party member with Adventurer 1. Adventurer 2 has low combat skill and no armor.
2b) Adventurer 2 i(g)nites a fire (the burn-y kind, not a campfire) stands in the fire, and waits.
2c) Adventurer 2 bleeds out. Adventurer 1 resurrects Adventurer 2 with the first intelligent undead interaction.
2d) Adventurer 2, now an intelligent undead, drinks the healing potion.
2e) Adventurer 1 draws their sword, waits for an opportunity (Normal strike or better in the advanced combat menu,) and beheads Adventurer 2.
Phase 3 (re-resurrection, preventing further hostilities:)
2f) Adventurer 1 resurrects Adventurer 2 with another intelligent undead interaction. Adventurer 2 immediately regrows all lost tissues, thanks to the healing potion they drank before they died.
2g) Adventurer 2 is now hostile (Lethal). Adventurer 1 yields.
2h) Adventurer 2 starts a conversation with Adventurer 1, and selects the "cease hostilities" option.
2i) Adventurer 1 continues the conversation, and selects the "Agree to cease hostilities" option.
If all has gone well, you now have a party containing:
- A legendary swordsman necromancer
- A low-skill intelligent undead with two or more spell interactions
Using the healing potions, it should be possible to stack even more spells on your undead adventurer through repeated killings and re-resurrections. Just be mindful of hostilities between your two party members. The vanish spell is particularly dangerous; my first attempt at creating an undead super-soldier failed when the test subject went invisible and beat my legendary necromancer to death with their bare hands. While it could be argued that this feat further proved the strength of my creation, I would prefer to have lived to see it.