Are the bonuses from hatch duplicates worth spending gems on? I’ve read that it reduces the number of seconds for all skills of that monster, I just wonder if a +1 bonus on a legendary monster would greatly affect the tide during battles 'cause I plan on spending further on the limited banner that contains the monster that I like. And also, how much bonus (duplicate: such as +1, +2 and so) do you think should you get in order to consider the bonus as worth it?
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A bonus +1 to +5 boosts the entrance speed of the monster significantly, +6 to +9 less.
+3, +6 and +9 reduces the TUs of the monsters skills.
A +10 will convert into a 6* ticket.
You can use potions on the monsters to archive that, or obtain a duplicate.
For potting monsters, you have to see if it’s worth. Its definitely worth to pot monsters like Polaboss, Novadrake or Doomgoo to +9, since they can sweep faster.
Monsters that have very slow moves or depend on their passives are often less important to pot.
Some monsters are important to pot because of their entrance speed to be faster than specific other monsters, usually used in the frontline.
TU = time unit
But most important for you is to save 500 gems for next shrine 
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Woah (•̪ o •̪), thanks for the detailed info bro, I gotta note that, yeah you’re right, better save gems for the next shrine instead.
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Killerdog created excellent guides for beginners, you might like to check some of them out, he did awesome work there, they are definitely worth to read.
New Player’s guide - I’m currently re-working this because a bunch has changed since I wrote it and I think there are quite a few things I want to add/improve.
Bonus potions and entrance speed guide
There’s a few others but those are probably the ones you want right now.
To your original post here…
It’s better to expand your collection of legendaries rather than purposefully hatch duplicates to get bonus. This is true even for veterans. New monsters are simply more valuable. The way to bonus legendaries is to get “legendary potions” from limited-time events and PvP. These let you increase the bonus on specific legendaries you care about. Over time, you’ll get most of your important ones to +9.
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