Are we ready to revise skills and feats in that case? I didn't think there was too much else to do for these.
Sure!
Well, they're a form of Wraith, so they ought to have similar skills & feats:
Wraith
5 HD, Str Ø, Dex 16, Con Ø, Int 14, Wis 14, Cha 15
Feats: Alertness (B), Blind-Fight, Combat Reflexes, Improved Initiative (B)
Skills: Diplomacy +6, Hide +11, Intimidate +10, Listen +12, Search +10, Sense Motive +8, Spot +12, Survival +2 (+4 following tracks)
The Wraith's feats look OK to me.
A Soul Beckoner has Int 13 and 4 HD to a Wraith's Int 14 and 5 HD, so it'll have a lot fewer Skill Points - 35 instead of 48.
Wraith's have maxed-out (8 ranks) their Hide, Intimidate, Listen, Search and Spot skills, plus 2 SPs in Diplomacy and 6 SPs in Sense Motive.
Doing the equivalent for the Soul Beckoner, I'd max-out its Hide, Intimidate, Listen, Search, Sense Motive and Spot with 5 SPs each, that leaves it with only its Charisma and synergy bonuses for Diplomacy, but I have no problem with that.