I was thinking for town portal.
The bells that are in each town could be tiable
maybe if you cast town portal to the bell.It will attune it self to it.
And each time you cast it, it will warp you there.
Or maybe a statue,
same idea.
Or... Attune your town portal to the bell and then you aqquire a Portal Gem, when you use it a portal will open.
1 use. Until you go back and attune your spell to it.
You can only 1 have spell attuned to the bell. 1 town. 1 gem.
This is pretty balenced.