Probably Feculent Beseechment - though given that that's also needing marks on apostle and target, which costs more points, it's not surprising.
Feculent Beseechment is AMAZING in the way it pairs with the Mark of Nurgle against the right threat:
Mark of nurgle reduces the odds of S4 and S8 wounding a nurgle marine BUT its not quite as good as +1 toughness because it doesn't help against S5, which is a LOT of anti-personnel fire, from heavy bolters to punisher cannons to chaincannons to big shootas.
Because Feculent Beseechment DOES give you +1 toughness, you THEN trigger the mark's rule - so a heavy bolter firing into NURGLE legionaries goes from needing a 3 to wound to needing a 5 to wound, halving the damage dealt.
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