Actually, LB1 & LB2 has the same burst effect, but that's the general idea, yeah.
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https://i.harem-battle.club/image/uz7
God I love Japan sometimes.
Honestly, dunno, but you were the one providing a guide with info, as it shows on my union's help page.
http://puu.sh/BnpNz/d9b1b12138.png
http://puu.sh/BnpO3/b765fcdd31.png
http://puu.sh/BnpOx/1e32dfaca8.png
Also, worth noting, when you apply Herc's debuff at 1* Weapon Break, it gets overriden by Hraes' debuff, Herc's doen't override Hraes'.
I just tried to keep it clean from too much detail since I meant to create that as a summary, not a full-blown guide. You'd use hero weapons at MLB in the end, anyway. Thought it's not worth specifically mentioning for each LB. But to clear things up, just as I mentioned, LB1 & LB2 gives the same burst effect. M-my bad, I guess..?
That's probably because Hraes is 20% & Herc's wep at 1* is 15%.. of the same frame.
Hmm, I wonder if it really gets to 20%. I mean, it could be easily tested though. JP Wiki only provides 15% for both LB 1 and LB 2 and 25% for MLB.
But for the test: Use Hraes' def down first and then try to overwrite it with Herc. If it does it is a refresh and will be 20%, if not it is lower, though 15%. I sadly dont have the resources to do this as I havent started a Herc relic yet.
But from the info provided so far, it seems to go like this:
LB 0 - No Burst effect
LB 1 - Burst Effect Stage 1
LB 2 - Burst Effect Stage 1 / improved Burst multiplier
LB 3 - Burst Effect Stage 2 / improved Burst multiplier
I just meant to clear something you were asking for, nothing else.
http://puu.sh/Bnqid/efd3c6575b.png
Went and did some quick tests. 2LB Nemea Skull cannot overwrite Hraesvelgr, but I figured maybe it just kept missing so I also did a damage comparison between 2LB Nemea Skull and Sniper Shot. Conclusion, it's definitely lower than 20%. I wasn't very thorough but it matches the wiki so that's good enough for me.