Blárserpent Kliff?

Owltome can get relatively all of the same effects as this if you want a cheaper option

Sagittae is going to activate just fine, as long as you use fortress def/res 2. Don't worry.

And if you're dead set on replacing it, any build that uses blarserpent can also use blarowl. Which is much cheaper.

Tsk Ur asking about foddering a unit that ull likely never even get. Like...what is the point?

Would you pull for him again? +Atk is actually fine if you ask me - a bit risky in some cases, but very often ok and actually good against a lot of tanks - but I consider -def one of his worst banes. Fortress def/res is really good and a lot of units are really good with it. 3/5 that you get a more suitable IV pulling him again.

Also, this is a thing. Shown here with tactics buffs, but he can work using double links too or stuff like mystic boost. Less tanky without merges, but he's a lot easier to merge and hits way harder so he can dedicate his special to recovering HP, which is something Kliff probably can't get away with. Maybe on spiral + aether + flashing blade... maybe.

Use another Fortress Seal to receive -3atk And some bônus You want

+Atk work just fine with his weapon, if you are using Fort Def/Res he has what 45 atk more than like 80% of units hit 50+ Atk