Quentin heads into a former monastery to find that Alice set up a summoning for him to trigger to bring about Friar Joseph in episode 2x08 "Word as Bond".
Source: What's Filming
Penny attempts to communicate with Julia and Quentin through a trapped ghost while they attempt to find out about the second key in episode 3x04 "Be The Penny".
The Leviathan agent reports her failure to acquire the amulet to Rama Khan, the head of the organization. Later, Alex and Brainy find the exterior of the building but are thwarted by security in episode 5x07 "Tremors". Rama Khan learns he is on thin ice with the Elder and Gamemnae convinces him to try something big while the planets are aligned in episode 5x08 "The Wrath of Rama Khan".