No monolith, but he had packed all his Necron 'foot' models in one corner of the board and his C'tan and his 8 destroyers on the other corner...
I needed to concentrate my forces to charge into 4 x 11 man squads of necrons and a squad of 'heavy weapon Necrons, but his C'tan kept tying down my units and sniping my characters who could hurt him by charging them and then killing the power claw mobs and then popping out of combat if I could have hurt him ... it was VERY frustrating being hit by a mob that ignores EVERY armour save ... including my Warbosses 'Cybork body' invuln save !