Once a Lich reaches level 30, then can get involve in a Nexus-scale project known as the Corpus Vitae: The Study and Research of Life. Those who wish to participate take the magical essense of the life they control - their pets - and pool them together into the Corpus Vitae project. The end result, they hope, will reveal new information to them about the nature of the spirits caught within the Nexus, hopefully giving them new insights or control to break free of their chains.
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Mechanics:
Liches at level 30 or higher can destroy their own pets and transfer the magic involved into the Corpus Vitae, a project that all Liches can participate in. Similar to the Lightspeaker endgame, this involves a tab at the bottom of the screen that allows the Lich to give up most of their pets and a selection of a plane: Purgatorio, Elysium, or Stygia. (Purg should be the default to avoid everybody just accidentally selecting Elysium by default.) Unlike the Lightspeaker, doing this destroys the pet and contributes the pet's summon MP towards to Corpus Vitae, with the amount as a "vote" towards the selected plane.
Pet sacrifice is based on the summoning cost, and is listed here:
- Zombies and Ghouls provide 10 MP.
- Necrophage provides 30 MP.
- Skeletons and Bone Guardians provide 10 MP.
- Fossil Monstrosity provides 30 MP.
- Will-O-Wisp provides 15 MP.
- Wight provides 20 MP.
This process continues until a total of 2000 MP has been sacrificed to the Corpus Vitae. Note that Liches don't get a notification how much MP has been sacrificed or how many "votes" have been cast. The transcended characters, wishing to keep options fair, hide the votes until the result becomes obvious.
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Result:
Upon completing the Corpus Vitae, it checks which plane has receive the most MP dedicated towards it. If Elysium wins, then every Lich who sacrificed any pets towards the Corpus Vitae immediately drops 10 Morality. If Stygia wins, then every Lich who sacrificed any pets immediately gains 10 Morality. If Purgatorio wins, then there is no morality shift.
On the plane in question, the Corpus Vitae is summoned. Everybody on the plane (along with all the Liches who participated) gets a notification that is has arrived. The Corpus Vitae is a monstrous Champion of the Elder Powers Wraith, having 500 HP, 1000 MP, unlimited AP, 70% to hit, 10% Defense, 10 death damage primary, and 10 arcane damage secondary. It drains half the damage dealt in MP from its target, recovering HP and MP equal to the amount of MP drained. If the target doesn't have any more MP, then nothing happens. It ignores planar pets and all pets but the Petmaster's titan pet, but attacks NPCs.
Each character it kills does not leave a body, and instead becomes a masterless Wraith with the same name as the killed character. This Wraith behaves just like any other Wraith that has broken free.
Any Lich which has contributed at least 100 MP towards the Corpus Vitae (5% of the total required) will get a notification of the kill. They receive 1 Kills stat when this happens, along with 1 Angel Killed, 1 Transcended Killed, or 1 Demon Killed if appropriate.
All Liches of level 30 will have the Corpus Vitae listed in their pet menu, along with its current HP, MP, and which plane it is on. The exact tile won't be shown to the players.
Liches cannot sacrifice pets to the Corpus Vitae project while a current Corpus Vitae is still active. They need to wait until the current Corpus is either killed or despawns before they can begin the process again.
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Notes:
A lot of these numbers are just made up and might not be the best fit. A minimum of 100 MP to get rewards and a goal of 2000 MP seems fair, since it would allow up to 20 Liches to participate and would reasonably allow 10-12 to devote pets without isolating it to a few devoted summoners. My experience with the Lightspeark endgame was limited towards the end of the breath, but I don't recall seeing even 10 names participating in that, so 20 should be fine.
If changing the numbers, keeping the "minimum" limit to 5% of the total ensures the same number of people can get involved. Lowering that allows more people to get involved, raising that means less people will get the Kills badge rewards.
If the MO change feels too harsh for players who might've just sacrificed one pet by accidnet or by curiosity, then perhaps limit the MO change to people who have sacrificed the same minimum 100 MP (5% of total) to the Corpus Vitae.
This looks similar to the Lightspeaker endgame, but with changes that I think people will find more fun and fit better with the Lich concept. Angels are about contributing for the benefit of many. Unaligned are more for individual choice and discovering the way the universe works. Hence, the voting (with the majority winning) and the theme of discovering truths about the Nexus, despite the risks.
The Corpus Vitae drains MP from its targets and heals HP/MP for itself to give it a bit more longevity, compared to other Elder Power Champions. This is in part to reward people who put days or weeks into summoning it, so that it doesn't just wander around aimlessly and despawn. My Revenant can kill these Champions in a single AP cycle, and I'm sure a Seraph/IB and probably many others could as well with some potion support, so I'm not much worried about the Corpus Vitae taking over any plane. Those extra abilities are more to just cause additional chaos while it's there and to kill off some NPCs or characters sleeping outside, thinking they are safe.
Pets are just assigned a cost towards the Corpus Vitae based off their summon/rejuvenate cost. The exceptions are the Necrophage and Fossil Monstrosity, which give MP equal to the zombies or skeletons sacrificed to create them. These could be adjusted to balance out the summon trees better.
Lich players seem to have fun with setting Wraiths free to terrorize local people, so I figure this should be something fun for them to do as well.
Depending on how the timing of things works best, the Corpus Vitae could be summoned immediately once its MP total has been reached, or it could be summoned at the end of a 24 hour period which will check if the total has been reached. Similarly, Liches could get the kills badge bonuses at the end of the same 24 hour period (similar to how Lightspeaker endgame works) and the ability to sacrifice new pets to the Corpus Vitae could be reset to become available at the same 24 hour period, rather than making it immediately available once the old Corpus has died.