Loa of Death can be new Hero of the Nexus. And his role will be “Support” . İ would suggest 2 ultimate spells for Bwonsamdi.
First Ultimate Spell
Bargain with death- Choosing an ally and give him/her the power of Death. Affected hero will get these passive buffs:
Soul Vampire-basic attacks of hero will get vampiric effect and per attack X% will be healed.
Death’s Touch- Hero’s attack speed will increase but he will lose armor in time during the effect of “Bargain with death”
As the 2nd ultimate, it can be,
Prisoned Souls
This ultimate will be AEO and tactical spell for teamfights.Bwonsamdi will use it on one enemy hero, and he will prison his soul and the enemies who stay next to him will lose their control and they will start to attack chosen hero by the Bwonsamdi for 5 seconds.