Discarded Refuse can only be used in combat, unsustains when out of combat and sustain cost is changed to a casting cost. It is not meant to be left on but to be used as a cooldown

Surge of Undeath now also heals minions
Necrotic minions can only be healed by themselves, other necrotic minions or talents that are not powered by nature

When Putrescent Liquefaction absorbs a dying ghoul/ghast, every two of them you'll get one soul back

such grave tree