Malik is encountered when approaching Moonrise Towers for the first time, where he will stop the party and probe at their tadpoles through the use of his own Mind Flayer Parasite Specimen. Upon recognizing the party lead as a True Soul, Malik asks for news from the field; the party can respond with a variety of dialogue options, but upon asking Malik why he is on guard duty at the entrance of Moonrise Towers will have him reveal it's to recognize fellow True Souls[1].
If Minthara's demise is prevented and freed from the Moonrise Towers Prison, the party can lead her out of Moonrise through the main entrance. Passing by Malik and Merim will have them block the party's path, demanding an explanation as to why Minthara is not in her cell. Convincing them that Minthara has been wiped and is at the party's whim would have them satisfied with the explanation, and let the party and Minthara leave in peace.
Defending Moonrise Towers
If the Nightsong is freed and the Harpers launch their assault on Moonrise Towers, Malik is killed during the subsequent battle. His corpse can be found at the bottom of the stairs of the main door entering Moonrise, at X: -157 Y: -135.
↑"Ah, one blessed like myself. What news, True Soul?" - Malik "I might ask the same. Why is one of our rank on guard duty?" "Who better to suss out his like?"