Predecessor Builds > Mourn > Make em' Mourn Their Grave (SUPPORT)
BUY DIVINE POTION FIRST! Frosted Allure into Giant's Ring are his core two items. If you need anti-heal, go tainted charm 2nd. If you are going against mostly physical damage comp or are facing multiple carries, go stonewall 3rd to heavily bolster defense. If you don't need anti-heal at all (rare) then you can sub it out for a useful tank item.
As a note: it is best if Mourn can tank and survive, give the team armor/buffs, debuff enemies and stick to targets. Going for healing items will not be ideal on Mourn. Magic power scales Q healing, but it takes a lot for it to be a noticeable difference, so magic power is not worth bothering on Mourn for support. These items help maximize Mourn's defense & team enchanting value with his teamwide durability buffs, with Giant's Ring giving high ability uptime, and Vanguardian + Everbloom giving the whole team a lot of defense on top of Mourn's contagion (Q) buff.
If you need teamwide anti-heal, tainted totem is a solid alternative to tainted charm. Combined with Mourn Q will allow him to give his team 7 secs of blighted touch, which is 100% uptime (3s Q healing, 4s buff, resets timer per heal tick)
Make sure to use Sanctification to shield your teammates in fights during crucial moments. Have fun making your enemies mourn!
