Can I use a Master Seal to promote into a previous class' promoted class?

My Robin is nearing level 20 and still a Tactician. Let's say I want to promote him into Grandmaster eventually, but I'd like to pick up Armsthrift first and take advantage of the base class' superior stat growth.
Can I Second Seal into Mercenary and then Master Seal into Grandmaster, or do I have to go back to Tactician first? If so, is it a good idea?
Best Answer
Yep, you sure can. You can even Second Seal him straight back into his current class; he'll start again at level 1, with all stats and skills intact.
Combining the cross-classing along with unlimited missions, the focus no longer needs to be on ensuring you get every single level's worth of growth out of a character. Just get the skills you need from the classes, and then throw them into their final class. If, by the time they hit max level and the stats are still too low, just Second Seal him back into it, and keep at it.
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What does a Master Seal do in sacred stones?
Fire Emblem: The Sacred StonesNameUsesEffect(s) / Note(s)Master Seal1Promotes all Level 10+ first-tier units (excluding Lords).Who can use the Master Seal in sacred stones?
Flavor textGameText (English)The Sacred Stones (Use screen)Use this on a unit Lv. 10 and up who has yet to change class.Path of RadianceAn item that allows units of level ten or higher to upgrade classes.Radiant DawnAn item that allows non-promoted units of level 10 or higher to upgrade classes. For beorc only.7 more rows•Apr 13, 2022When to Promote \u0026 Change Class - Fire Emblem Three Houses
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