|All of these Undead are within Kingsley Warlock's Control Zone|
- Maintain or regain Control of Uncontrollable units within their Control Zone (see below)
- Recover extra Action Points for Undead units, subject to those units' limits (Influence)
The key then is striking a balance between the number of Controllers and Undead in your Party. So far the typical number of Guidance Points per Controller is 2, with a couple of exceptions (Promethea and Luther Delacroix both have higher than usual Guidance Points values).
So while Undead are relatively cheap units to fill out a Party, one vital element looks to me to be in making sure your Party has enough Guidance Points available, or off-setting Uncontrollable where possible (Styx can effectively avoid Uncontrollable for example; Type-005's and Type-020's have limited upgrades that allow a single choice of those units to ignore Uncontrollable). Of course, it also means clustering units to an extent to ensure coverage of Guidance Points since Control Zones are typically 8 inches from a model.
Figure 1: Kingsley Warlock has 2 Guidance Points; when choosing the Party, if one of the Type-005's is upgraded to a Type-006: Commander, then he could use those Guidance Points to ensure the Type-020: Verrier does not become Uncontrollable, leaving one Guidance Point to boost AP.
If, when choosing the Party, the Type-020: Verrier is upgraded to a Type-021: Queen, then the Type-005's would ignore Uncontrollable as would Styx, as they would be of lower Level. This would allow Kingsley Warlock to use 2 Guidance Points to boost the AP of Undead (basically an extra AP for 2 units).
Styx cannot benefit from extra AP from Kingsley Warlock as only Promethea may spend Guidance Points on Styx. With his Uncontrollable value of 1+, he should always pass the roll unless a modifier applies.