Dark Harvest vs Predator vs DeathFire Touch +AP from old runes on Karthus' Ult: some math

TL;DR Last season, the damage added by the runes was way over the top. This preseason, Dark Harvest is in a midway spot between last season and the old runes (at 0 souls).

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Karthus' ult at level 18: No runes: 0 AP: 550 damage 350 AP: 813 damage 700 AP: 1075 damage

With the old runes/masteries (DFT+33 from scaling AP glyphs and AP quints)(DFT actually applied to every target, not just the lowest one, but let's ignore that here): +0 AP: 583 damage +350 AP: 889 damage +700 AP: 1195 damage

Last season, with Predator (the rune he used to take the last season): 0 AP: 730 damage, 25% more damage than DFT+old runes 350 AP: 1080 damage, 21% more damage than DFT+old runes 700 AP: 1430 damage, 20% more damage than DFT+old runes

Now, with the new Dark Harvest: 0 AP: 630 damage +5 per soul

• needs 20+ souls to outscale Predator
• needs 0+ souls to outscale DFT+old runes (8% more damage at 0 souls)

350 AP: 945 damage +5 per soul

• needs 27+ souls to outscale Predator
• needs 0+ souls to outscale DFT+old runes (6% more damage at 0 souls)

700 AP: 1260 damage +5 per soul

• needs 34+ souls to outscale Predator
• needs 0+ souls to outscale DFT+old runes (5% more damage at 0 souls)