Need help with designing 2 new abilities

I want to design 2 new abilities for my heroes to use in my upcoming campaign, the Rise of the Scourge (a Reign of Chaos prologue). Tell me how to make them:

1) An ability which works like Diablo II's Blood Golem- creates a summoned unit which steals life and shares life with the hero. Obviously, it must combine a modified vampiric aura with permanent spirit link. How do I do this?

2) An ability which combines Parasite and Reincarnation- slowly deals damage to a unit, and if the hero dies before that unit the unit will immediately die and the hero will burst from its corpse.