Hello. I've been running the D&D5e campaign Waterdeep: Dragon Heist for a few players who really suck at combat, and instead enjoy intrigue and the like. The combination of the two lead to them falling unconscious in the Xanathar hideout sewers, where they ended up becoming servants of Nihiloor, seeking to gain power within the government (probably via bodysnatching) and slowly take over Waterdeep whilst ridding it of the rivaling gangs there, overthrowing Xanathar in the process and seeking the Stone of Galor for himself. Now I have him using the players as a means to gain information (transmitted through their pet intellect devourer) and eventually do some bodysnatching, but I have no idea where to start. Any ideas for how this mindflayer can use the party to do this?