What is the correct plural form of Succubus?

[nmiz]

This got me puzzled. The guys from Nival used succubi as the plural form, suggesting they regarded succubus as a noun of the second latin declension ending in -us.
But the second declension is comprised of mainly masculin and neutral nouns, with just a few feminin nouns as exceptions.
Wouldn't it then be more logical to change succubus by the fourth declension, which is comprised of mostly feminin nouns that end in -us.
If that was the case the plural would be succubus.
What do you guys think?

[theLuckyDragon]

n., pl. -bus·es or -bi (-bī', -bē') also -bae (-bē', -bī').
A female demon supposed to descend upon and have sexual intercourse with a man while he sleeps.
An evil spirit; a demon.
[Middle English, from Medieval Latin, alteration (influenced by Late Latin incubus, incubus) of Latin succuba, paramour, from succubāre, to lie under : sub-, sub- + cubāre, to lie down.]

I don't think the guys at Nival gave any attention to the noun's Latin origins, and I don't think it's even that relevant. It's a word in English and, as this dictionary entry shows, one of its accepted plural forms is succubi.

[nmiz]

You're probably right. I should have regarded the word as Englisjh.

[Kalah]

It's succubi.

[blizzardboy]

Succubi or Succubae would both be acceptable. Spellcheck says that succabae is incorrect, but it's wrong. It definitely wouldn't be "succubus".

[ThunderTitan]

Seeing how it's most likely a middle age word i'd say however they spelled it... (with an -i it seems: http://en.wikipedia.org/wiki/Sucubus )