I finally got around to picking up a Tantalus - it's arriving from the Webway in a few weeks, so I have time to plot. Here are some plans I have in using it. Thoughts?
1- The obvious. Haemonculus Covens sniper (can combine with other options)
2- The other obvious. 15 Kabalites and an Archon. 4 blasters / drop off squads where needed for objectives.
3- The party bus. Archon, Succubus, Haemonculus (all with various relics / warlord traits) + Wyches. Arrive from space on turn 2 for a turn 3 disembark / charge.
4- The distraction. 15 Wyches (3x5) and a Succubus. Load up with shardnets and blast pistols. Cult of the Red Grief - advance 32" and charge turn 1.
Note - I have the following units: Kabalite Warriors, Wyches, Wracks, Archon/Succubus/Haemonculus, Venoms, Raiders, Ravagers, 1 Voidraven Bomber, Scourges, Hellions, Reavers, Clawed Fiends + Beastmaster, Sslyth, Incubi. Wouldn't be too hard to convert up other Court of the Archon units if needed.