Surprisingly enough the greatest brake on a Warlocks use of Chiling Tentacles is his party mates. The Warlock in my campaign has used the Invocation I think less than 1/2 a dozen times, certainly that is all I remember.... Like Evard's Black Tentacles, use of the spell basically precludes the party from melee, and the cold damage from Chilling Tentacles makes that even more so.
The Warlock in my group has complained many a times that something is in his way to cast that spell. Now a group that focused as their main tactic that spell and Ranged Attacks, could be a terror for some time. I personally think the problem is self correcting, Chilling Tentacles ad nauseum + Ranged attacks would get extremely tedious if used every encounter, and I cant see any group of people wanting to have fun, sticking with it for ever. Again in a Dungeon with small rooms this is not a viable tactic because of the fixed radius of the Invocation.
A Warlock on a Huge Battlefield with this Invocation can be quite adept at terrain control. Still Probably not as good as a Druid, but not bad at all.
As for a Warlock in a scenario where effective marshalling of a parties limited resources, a Warlock character is very much like a Rogue. The prime limitation on a Rogue is their Hit Points and their companions.
The Warlock in my group has complained many a times that something is in his way to cast that spell. Now a group that focused as their main tactic that spell and Ranged Attacks, could be a terror for some time. I personally think the problem is self correcting, Chilling Tentacles ad nauseum + Ranged attacks would get extremely tedious if used every encounter, and I cant see any group of people wanting to have fun, sticking with it for ever. Again in a Dungeon with small rooms this is not a viable tactic because of the fixed radius of the Invocation.
A Warlock on a Huge Battlefield with this Invocation can be quite adept at terrain control. Still Probably not as good as a Druid, but not bad at all.
As for a Warlock in a scenario where effective marshalling of a parties limited resources, a Warlock character is very much like a Rogue. The prime limitation on a Rogue is their Hit Points and their companions.