CapnZapp
Legend
Hello from the future 
Just to ask - the previous comments regarding Chill Touch risks vs reward, having to get close and personal -
- was perhaps Chill Touch a "touch spell" once in the playtest?
In the final PHB, its range is 120 ft, making it an excellent regeneration-shutter-down for any monsters, not just Trolls (which are relatively low CR).
After all, the more epic threat, the more reason you have to stay at a healthy distance away...
And if you include two warlocks in your party, they can alternate between Chill Touch and Repelling Blast to ensure the foe never gets close, and never gets to use its regeneration. That's a good start right there, if you want a cheesy win.

Just to ask - the previous comments regarding Chill Touch risks vs reward, having to get close and personal -
- was perhaps Chill Touch a "touch spell" once in the playtest?
In the final PHB, its range is 120 ft, making it an excellent regeneration-shutter-down for any monsters, not just Trolls (which are relatively low CR).
After all, the more epic threat, the more reason you have to stay at a healthy distance away...
And if you include two warlocks in your party, they can alternate between Chill Touch and Repelling Blast to ensure the foe never gets close, and never gets to use its regeneration. That's a good start right there, if you want a cheesy win.