Improve the Objective Control characteristic of Chaos Knights CHARACTER models from your army by 2. In addition, once per battle round, if your WARLORD is on the battlefield, you can use the Claimed for the Dark Gods stratagem for 0CP.
Check the keyword before you dismiss the first clause as narrow. Chaos Knights Titanic datasheets that carry CHARACTER include the Knight Abominant, Desecrator, Despoiler, Rampager, Ruinator and Tyrant, plus all six Chaos Cerastus and Chaos Questoris Imperial Armour Knights. In a typical Chaos Knights list the rule is close to army-wide, which is not how it reads.
The second clause is a Command Point engine. One free use of a specific stratagem per battle round, gated only on your Warlord being alive, is worth roughly a Command Point a round in a faction that has few models and therefore few other things to spend on. The pack amends that stratagem's timing, which is why the next section exists.
TAKE AND HOLD as a force disposition is consistent: this detachment is trying to win on objectives, and +2 Objective Control on models that already have high Objective Control is how it does it.