Is succubus in savage species underpowered?

One of my friends mentioned wanting to play a succubus in a pathfinder game and wants to use the savage species succubus class for it though at a glance the succubus class in savage species seems underwhelming to say the least with low combat ability and low utility. (At least compared to a caster of the same level.) What I wish to ask is that is it underpowered or would it be something like tier 3?

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Can a Succubus use its Charm action to make my undead minion attack me?

I animated a corpse (into a zombie) using the animate dead spell. During a fight with a succubus, the succubus tried to charm the zombie using its Charm ability:

One humanoid the fiend can see within 30 feet of it must succeed on a DC 15 Wisdom saving throw or be magically charmed for 1 day. The charmed target obeys the fiend’s verbal or telepathic commands. If the target suffers any harm or receives a suicidal command, it can repeat the saving throw, ending the effect on a success. If the target successfully saves against the effect, or if the effect on it ends, the target is immune to this fiend’s Charm for the next 24 hours.

The zombie is not immune to being charmed according to its stat block – but the animate dead spell says that I command the undead how to act.

Can the zombie be charmed into fighting me? In general, can creatures you command (familiars, summoned, animated) be charmed into fighting their master?

Does a “suicidal command” by a succubus trigger two saving throws?

If a Succubus charms a humanoid with the Charm action, and then commands the humanoid to do something suicidal, the target gets to roll a saving throw. Succeeding means they do not perform the suicidal command – it interrupts the command.

But if they fail the saving throw, they go through with the action and take the damage, but should this then result in another saving throw?

If the target suffers any harm or receives a suicidal Command, it can repeat the saving throw, ending the effect on a success.

My interpretation would be that the two are different triggers, even if they happen during the same round. The Succubus gives a suicidal command, the humanoid rolls a saving throw, fail, and then they do the action when it is their turn, taking damage and rolling again.

If not we end up with the awkward situation where falling off a 1000-foot cliff doesn’t even give you a chance to save against being charmed, just because you already failed the save for the command itself.

What’s the closest-to-legal way to make this semi-homebrew savage succubus have LA+0 and a low level?

I wanted to make a weaker succubus character, so I didn’t need all the features of the ECL 12 version in the Monster Manual. Savage Species offers a progression on pages 195-197 that gives everything I really want by ECL 5–problem being, that’s still 3 HD with a +2 LA. But that’s at least way better than 6 HD, LA+6, so I decided to go with it, at least as a starting point.

(The specific homebrew aspects are as follows: 1: Savage Species says you need to finish an entire progression, but I’m cutting it off at ECL 5 to describe a “lesser succubus”–characters can’t take any more Succubus class levels even if they wanted to. 2: Since Savage Species is 3.0, where succubi had way more spell-like abilities and a few other differences compared to 3.5, I’m taking only the features they have in common–so claws that deal 1d3, SLAs beginning and ending with detect good, detect thoughts, and suggestion, and only the following class skills: Bluff, Concentration, Disguise, Escape Artist, Hide, Knowledge (any 1), Listen, Move Silently, Search, and Spot. In the case of Alternate Form/Change Shape which is inconsistent between editions, I just made it work like the Changeling ability (RoE p.41), but usable as a standard action and with the option to hide wings/tail. 3: Since bonus languages aren’t listed, I gave it “Any” (other than Druidic, etc.). 4: Since favored classes aren’t specified beyond the Succubus class used for the savage progression, I made its favored classes any of the three listed as “the best multiclassing choices” (p.197), whichever one the character takes a level in first. 5: A very minor change to its type/subtype, to make it Native. 6: Not a change to the race itself, but while Savage Species only ever tells players to use standard ability score assignments, the character uses a 15-point point buy and doesn’t gain full hit points from her first HD, to represent being nonelite (with the huge racial ability score bonuses, the result is an ability score array that isn’t too far from what a standard character gets, anyway))

Almost everything that the ECL 5 “lesser succubus” has is important, so I don’t want to remove features beyond what I’ve taken out already. But LA+2 is pretty harsh (and LA is just dumb anyway), so I’d like to get rid of that, too. I don’t want to add any class levels, so LA Buyoff is sadly not going to work. I’m willing to add RHD, although I worry that doing so might give the race combat strength approaching the “full-powered succubus”. All in all, my goal is to bring the level adjustment to +0 (and keep it at +0, from character creation all the way to 20th level+) without sacrificing racial features, and ideally without increasing number of HD (but absolutely not giving more HD than the MM succubus).

(I’d rather keep the race as intact as possible, but I am willing to get rid of detect good, which is alright but not as useful as the other SLAs, and the Automatic Languages, which are made pretty much obsolete by tongues. A lower NA bonus would be acceptable, but NA is always nice so I’d like to keep it as high as I can)

It’s my understanding that nothing fully-RAW will get the race where I’d like it. So how can I accomplish the stated goals while being as-close-to-RAW-as-possible? Minor homebrew and/or cheese is welcome where necessary.

(Also, it’s not campaign-dependent, so I can’t just “ask the DM”. Ideally I’d like a general-use setup that’s as close to “legal” as possible. In effect, if joining campaigns and convincing DMs to allow homebrew races is a skill check, I’d like to keep the DC as low as possible, so that out of X-many possible DMs, a higher percentage of them would theoretically approve.)

What happens to a soul corrupted by a succubus?

The lore text on Succubi / Incubi states the following (MM, p. 284; emphasis mine):

A mortal bequeaths its soul to the fiend not by formal pledge or contract. Instead, when a succubus or incubus has corrupted a creature completely — some say by causing the victim to commit the three betrayals of thought, word, and deed — the victim’s soul belongs to the fiend. The more virtuous the fiend’s prey, the longer the corruption takes, but the more rewarding the downfall. After successfully corrupting a victim, the succubus or incubus kills it, and the tainted soul descends into the Lower Planes.

How should this sentence be interpreted? Is the victim’s soul converted into a low-level devil, demon, or another succubus/incubus? Does it get consumed by some fiend like a midnight snack?

And if none of the above are the case, what does happen to it?

I don’t think D&D 5e answers this question, so I’m open to other-edition-based answers as well. I’m mainly looking for official lore information based on the Forgotten Realms setting.

Does a succubus’ charm end when it dies?

The Succubus’ charm says that:

One humanoid The Fiend can see within 30 feet of it must succeed on a DC 15 Wisdom saving throw or be magically Charmed for 1 day. The Charmed target obeys the fiend’s verbal or telepathic commands. If the target suffers any harm or receives a suicidal Command, it can repeat the saving throw, ending the effect on a success. If the target successfully saves against the effect, or if the effect on it ends, the target is immune to this fiend’s Charm for the next 24 hours. The Fiend can have only one target Charmed at a time. If it charms another, the effect on the previous target ends.

So we know that the effect ends if the succubus charms another creature, and that the creature can re-attempt to make its saving throw if it takes damage or is given a suicidal command.

What happens if the succubus charms a creature, and then dies shortly after? Does the effect end, or does it continue until the creature takes damage or after 24 hours?