Decided that if everyone else is doing it, I might as well exploit Shards too. Heh.
Field U4 Haunting - Maxed except Swarmlings(reason below).
1e15 / 999 Waves / 999 Monsters / 69.70 Multiplier / 35 Pool Multiplier Estimate / 2.41 Talisman Multiplier = ~170,000 XP per monster required.
Now, the reasoning. Even before the Freeze Debuff that Swarmling Domination brings, it already drastically reduces the base XP.
See - Base Endurance = Unknown % Norm/Swarm/Giant.
Giant Endurance = U*1.35 Giants. Giants give 50% more XP than normals, and assuming that the extra % of giant waves decreases the % of swarm & normal waves(duh), that bonus increases further.
So I estimate that having 35% more Giants and 0% more Swarms would give ~33%(0.33) * 0.35 * 150% = +17%.
Furthermore, 33% * 1.35 = 44.55% total giant waves. Reducing both Normal and Swarm by ~5.5%, yes?
swarms give 0.5x XP. 33% -5.5% = 27.5%. 33%/27.5% = +20% more XP from less swarm waves(I think).
Now, plug it into the above formula for XP/monster. If you change 69.70x to 78.10x, you need ~146,000 XP. If you divide 170,000 by 1.2 AND 1.17, you get... 121,000.
That's my reasoning anyway. Also, with the Freeze Debuff with that trait, that already counts for +10% extra xp/monster in my book for that much less risk and hassle. Therefore, that is why I refuse to play Swarmling Domination.