So I have a theory about why the "It's so easy to break away from" isn't really an issue...
1) Unless your opponent is a caster themselves, why would they think "Hey if I just move a few feet further away surely this won't effect me anymore"? I mean sure dive behind cover is a viable thought process but I think most people and monsters as written in the book would try to close and kill the user. It's not honestly that much different than trying to close with an archer shooting arrows at you.
2)Concentration isn't really that hard to maintain on average. Sure the enemy might close and hit you but does anyone play a caster with less than a +2 con modifier(yes I know some obviously do) because I'm guessing they are the minority. Meaning you succeed 40% of the time so you should get a couple of rounds in of the spell minimum.
3)If I'm casting this spell(again this is me personally) I'm going to be casting it most likely on someone locked in combat with another person. Why you ask? So that if they decide they want to hit me they have to run away from someone else and risk an opportunity attack to do so. I mean why would you walk up to someone, un-engaged in the combat yet and cast this? That is basically just risking wasting your spell slot.
I honestly don't see a single problem with this spell as written. Take the combat caster feat at 4th level for advantage on concentration checks(because it's amazing) and this spell quickly becomes a solid spell for regular use even if you're somehow standing completely in the front(or ambushed while skulking in the back). Obviously some peoples experiences have differed but with some basic tactics and the DM not metagaming the enemy logic for "I'll just move 35' away and end the spell" I think the spell as written is solid.
1) Unless your opponent is a caster themselves, why would they think "Hey if I just move a few feet further away surely this won't effect me anymore"? I mean sure dive behind cover is a viable thought process but I think most people and monsters as written in the book would try to close and kill the user. It's not honestly that much different than trying to close with an archer shooting arrows at you.
2)Concentration isn't really that hard to maintain on average. Sure the enemy might close and hit you but does anyone play a caster with less than a +2 con modifier(yes I know some obviously do) because I'm guessing they are the minority. Meaning you succeed 40% of the time so you should get a couple of rounds in of the spell minimum.
3)If I'm casting this spell(again this is me personally) I'm going to be casting it most likely on someone locked in combat with another person. Why you ask? So that if they decide they want to hit me they have to run away from someone else and risk an opportunity attack to do so. I mean why would you walk up to someone, un-engaged in the combat yet and cast this? That is basically just risking wasting your spell slot.
I honestly don't see a single problem with this spell as written. Take the combat caster feat at 4th level for advantage on concentration checks(because it's amazing) and this spell quickly becomes a solid spell for regular use even if you're somehow standing completely in the front(or ambushed while skulking in the back). Obviously some peoples experiences have differed but with some basic tactics and the DM not metagaming the enemy logic for "I'll just move 35' away and end the spell" I think the spell as written is solid.