jgsugden
Legend
With average rolls and a typical sized party, PCs will end up with roughly 6 permanent magic items per PC by level 20, with half of them attuned. For an up to 15th level adventure, you should see about 75% of that amount (4 or 5 per PC) by the end of the adventure.
You're going to see overpowered (relative to design mechanics) PCs if they have 3 or 4 permanent items by 5th level, or more than 6 by 10th. However, if you roll ability scores, a lot of PCs are already exceeding recommended power levels with their higher than expected attributes where an extra +2 beyond what a point buy would have is roughly equal to a table H permanent item (Ioun Stone).
Regardless, in a 15 level published module, I would not worry about it too much. For the life of the adventure, it should be self balanced. Keep to the module and you'll be fine. If, at the end of the adventure you wish to continue, look at the items that the PCs have and - if overpowered - adjust. A thief, a monster that eats magic, or a story in which they need to give up items to get ahead (the magic fire eats items before answering a riddle, you need to give up a magic item to the baron before he'll reveal his clue, etc...) can help rebalance the game.
And when all else fails, TPK and start anew.
You're going to see overpowered (relative to design mechanics) PCs if they have 3 or 4 permanent items by 5th level, or more than 6 by 10th. However, if you roll ability scores, a lot of PCs are already exceeding recommended power levels with their higher than expected attributes where an extra +2 beyond what a point buy would have is roughly equal to a table H permanent item (Ioun Stone).
Regardless, in a 15 level published module, I would not worry about it too much. For the life of the adventure, it should be self balanced. Keep to the module and you'll be fine. If, at the end of the adventure you wish to continue, look at the items that the PCs have and - if overpowered - adjust. A thief, a monster that eats magic, or a story in which they need to give up items to get ahead (the magic fire eats items before answering a riddle, you need to give up a magic item to the baron before he'll reveal his clue, etc...) can help rebalance the game.
And when all else fails, TPK and start anew.