First off, thanks everyone who checked out the last blog post and offered help on what I should do. You are really awesome and my party officially hates all of you.
Second! What happened. So, essentially what I decided on happening is having the team go in alone at first, taking out the ogre monster, as well as the grimlock and the 3 manes that spawning from it. They got smacked around a little to soften them up, and then the succubus joined in, after being attacked by a mysterious stranger who was able to burn away her other-worldly protection against material-plane weapons with an arrow. After another battle to soften them up, the succubus then morphed into a succubus/troll tree monster, who was able to use an AoE charm to capture most of the team except for the team sorceress. Before the creature could kill them (hold on, it'll happen) the paladin comes in to save them staving off the monster and allowing the party to recover from their charm. However, having been fighting other monsters while the team tackled the main threat, he is already wounded and over-exerted, trying his best to stave off the beast, dealing around 30 points of damage, which the creature insta-heals from and then dishes out 20+ points, essentially shredding into the paladin. While taking out the monster's exposed roots, the source of the monster's healing, the druid and ranger do their best to support and heal the paladin while trying to drag him away from the fight, though he does push them back, signifying his willingness to die to give them more time. After destroying the roots and knocking her down to certain hp, she then rips herself from the earth and goes straight for the gunslinger due to being god-touched and drops him in one turn, ripping into his chest and then biting down and tossing him like a rag doll. Total silence until "YOU KILLED HIM!!!" After alleviating fears that he was KO'd and not insta-killed, the paladin then eventually surprises the monster, calling down a favor of his god Bahamut, catching himself in the explosion of energy, sending him flying, KO'd as well. Although still alive, the creature is then impeded from Bahamut's attack, the team able to attack and dispatch the monster without anymore losses, the druid, meanwhile, performing MASH-level meatball surgery to keep both the gunslinger and the paladin from dying. In the end, the ranger was able to get the last shot in, killing the monster before anyone else was harmed.
It was their most intensive fight since the first session, and from this alone they were able to get up to lvl 4 (although they did get the experience points, I was threatened with my life if they didn't get to lvl 4). So yeah, some nearly died and they feared for their lives. GG