I like the activities in the seal of Undying as they are grindy, but very much achievable to do solo. The only exception is the Collections step as you need to get the Spear of the fore ship.
This ship require you to do a 980 Nightfall: the Ordeal. This is a difficult activity when most players will have to attempt it before the season end in a few weeks. Most will be well below 980 and with the many, many modifiers this is far from a fun activity: [url]https://jimiwikman.se/blogs/entry/14-nightfall-the-ordeal-980-suffering-for-a-crappy-ship/[/url]
As much as I like the rest of the activities I fear that this step in the grind will prevent many players from getting this seal and it will be very rare indeed.
Unless this is intentional I suggest you consider this for future seals that will be limited in time.
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Getting titles should be one of the harder things to do in the game. 980 nightfall is pretty objectively the single hardest activity that is recognized in game (aka not self imposed like 2 manning raids or soloing the dungeon) so i think it is best if you have to do it