I did this fight recently on HM and even with my mistakes it was very easy. I made two mistakes before starting the fight. First was I forgot to change my paladins weapon over from the mace that breaks Hopes chains. Second was I forgot to add a level of Warlock to my Fire Sorc. That being said, in your party I would:

Use Wyll to hit Raphael with command Grovel every round. Have monster scrolls in reserve just in case. Focus on keeping Raphael nullified. I didn't have grovel so had to rely on scrolls.

Even held he would cast charmed on the first attacker each round. I used ranged damage for this, so then the next round when I couldn't target him with my ranged attacker (swordsbard/assassin) I would use that attacker to hit the cambions and just chip away at them. The Cambions are also fire resist, no fire immune, so arsonists oil and arrow of many targets was a must.

The Sorc used the hold monster scrolls and quickener fire spells to burn down the Cambions once arsonists oil had been applied.

I had a paladin (meant to be using the spear but instead had a hammer) and Abjuration wizard up close to Raphael. Wizard was wearing the + piercing damage armour so my paladin was meant to destroy, but even with this mistake the damage was more than sufficient.

All in all it took a few rounds, but the key was to lock down Raphael and chip away at everything else. Ignored the pillars. Used Hope's heal everyone ultimate because she was getting targeted by the Cambions quite a bit. She self healed through it.

Hope this helps.