Elemental Envoy is fantastic!

[MaxiDuRaritry]

You guys are missing the point! Burrow Speed! How can the ability to destroy dungeon walls at-will not be worth a feat? Screw combat capability! ( though vigor + share pain still works). BURROW SPEED! WALL DESTRUCTION! TUNNEL BYPASS DUNGEON PUZZLES!

Or you could just take time hop as a power known and not permanently waste a feat.