Ceaseless Cannonade
A shooting permission plus a keyword grant. Ceaseless Cannonade: each time an ASTRA MILITARUM TITANIC or ASTRA MILITARUM SQUADRON unit from your army is selected to shoot, models in that unit can target enemy units within Engagement Range of that unit, including with Blast weapons, provided no other friendly units are also within Engagement Range of that enemy unit; and when doing so, those models do not suffer the penalty to their Hit rolls for being within Engagement Range, excluding attacks made with Indirect Fire weapons. In plain terms: your super-heavy can fire its main gun into whatever has charged it, which is normally the one thing a tank cannot do. Read the proviso, because it is the limit that matters in play: no other friendly unit may also be in Engagement Range of that enemy, so screening your own tank with infantry switches the rule off. The second half is the Keywords grant: in the Muster Armies step you can select one or more ASTRA MILITARUM TITANIC units from your army to gain the Character keyword, and the pack's own Designer's Note spells out the consequence, which is that those units can be given Enhancements and one of them can be your Warlord. That is what makes the four enhancements below usable at all, since three of them require a Titanic Character.