Temple Conversion to Lolth

You corrupt an already existing temple you can see within range, converting the altars and shrines to those of the Spider Queen. The temple must fit within an unoccupied cube of space, up to 120 feet on each side. The temple remains until the spell ends.

However, unlike the one-cast-per-day to make the temple permanent like the temple of the gods spell, this is a ritual spell that requires a great amount of preparation, several specific components, and a significant blood sacrifice to succeed. First, the ritual can only be cast on the night of a new moon, creating a sky of darkness.  Second, the ritual's casting time must be started at sunset, for it symbolizes the last sun the sacrifices will ever see.  Once the casting time is completed, the Temple of Lolth will form around the original around in the Ethereal Plane. This will temporarily grant any creature that can call a Temple of Lolth its lair lair actions, but only for the one-hour duration of the spell. However, time is of the essence. Before the spell's duration ends, you must sacrifice no less than five Small or larger humanoid creatures who are marked as enemies of Lolth--including a wood elf, a moon elf, a sun elf, and a drow who has either lost Lolth's favor or has foolishly renounced the Spider Queen as their goddess--within the temple's walls to permanently corrupt and transmute it to Lolth's visage. The fifth sacrifice must be a creature who would reasonably worship the deity to which the original temple it is dedicated to. Upon a sacrifice's death, their soul is trapped within the temple. While not necessary, it is recommended to destroy the sacrifices' corpses to prevent any attempt to return them to life outside of [Tooltip Not Found] or wish. If the five sacrifices are successful, a yochlol will appear upon the end of the hour in drow form to take her queen's prizes' souls to torture for eternity into the Demonweb Pits. The yochlol uses an action to collect a soul as if under a delayed soul cage spell. Upon receiving all sacrificed souls, the yochlol will return to the Demonweb Pits. Only once the yochlol escapes does the temple remain converted to Lolth's will. If this ritual is interrupted any time during this process, the spell fails, the spell slot is lost, and the ritual must be started all over.

Apart from making sure the temple is dedicated primarily to Lolth, complete with dim lighting and the smell of a combination of sickly-sweet spices native to the Underdark and strong incenses made of poisonous plants (to ingest, not inhale), you make all decisions about the temple’s appearance. The interior is enclosed by a floor, walls, and a roof, with one door granting access to the interior and as many windows as you wish. Only you and any creatures you designate when you cast the spell can open or close the door.

The temple opposes celestials, elementals, fiends opposing Lolth, and undead. If a creature of those types attempts to enter the temple, that creature must make a Charisma saving throw. On a failed save, it can’t enter the temple for 24 hours. Even if the creature can enter the temple, the magic there hinders it; whenever it makes an attack roll, an ability check, or a saving throw inside the temple, it must roll a d4 and subtract the number rolled from the d20 roll.

Finally, whenever any creature in the temple regains hit points from a spell of 1st level or higher, the creature regains additional hit points equal to your Wisdom modifier (minimum 1 hit point).

Uncorrupting the Temple. Despite the permanence of the means to convert the temple to Lolth's domain, all hope is not lost if the spell succeeds. If all tools of Lolth worship are removed from the temple, a creature who opposes Lolth can cast a dispel magic spell at the point of origin to attempt to return the temple to its original form (DC 17 for any spell slot below 7th level). If antimagic field is cast, it will temporarily show the temple's original state, starting from the point of origin from which the ritual was cast. However, antimagic field will not revert the temple to its original state.

Destroying the Temple. The temple is made from opaque magical force that extends into the Ethereal Plane, thus blocking ethereal travel into the temple’s interior. Nothing can physically pass through the temple’s exterior. A disintegrate spell destroys the temple instantly. However, if used, it will not revert the temple back to its original state, but now an empty husk.