Gem Mine. If your Kael can solo Mino 15, he will be the source for getting masteries on all other champ. Other than that, leave them until your max energy gets to 130. After that, you'll mostly use them for extra energy when you're trying to complete something. 

Gem mine if you plan on playing 6+ months.  Not shards.  Masteries for uugo would be a good investment too.  Don't want to waste energy in mino until you can do level 15.

I  have  the  gem  mine  level  3  already.  I'm  pretty  sure  I  can  only  do  Stage  12  at  this  point .

Why  not  shards  btw?  For  900  gems  I  can  get  11  Ancients.  6  pack  of  Ancients  cost  $49.99  and  15  is  $99.99.

I'm  also  only  Day  24  playing  so  far,  and  dont  have  a  lot  of  great  champs.  I  do  currently  have  Kael  60,  Warmaiden  50,  Uugo  50,  Soulbond  Bowyer  50,  Kurzad  Deepheart  50,  Apothecary  40,  Spirithost  40,  Diabolist  40,  Gorgorab  40,  Siegehulk  40,  and  a  couple  others...

I did few mistakes on that buying shard with gems . (70 days in on reset in few hours)

You dont want to do that , since energy will give you way more value and progress ! And trust me blue shards are rarely pulling you something worthy :P 

Did you buy all the market slots ? Ive gotten over 10 shard in 2months+ from there , 20-30 from random dungeons and clan boss , etc . So there is little to no point in buying them with gems !

Edit : You also have pretty good start up , just keep getting 60 for now , ask forums or follow guides on which one to do next and focus on that , will take you way further than a handful of rares that may or probably wont be useful much !

Uugo, gorgorab, and apothecary are worth 6stars.  So you have undeveloped champs already.  Most people waste gems/money on shards then cry they don't have any books or more importantly enough decent gear to properly equip.

Lack of champs is generally the least concern for an account.  But chasing butterflies and opening shards is fun :) 

I didn't use a legendary champ for 6 months, using rares and epics is best way to play early on.  Now having a gem reserve to buy shards to finish off a fusion event or 150 guaranteed champ, that makes sense to me.

So  should  I  invest  more  into  Masteries  or  is  it  better  to  just  spam  gems  on  buying  energy?  

The best is saving those gems for when you truly need energy(fusion come to mind right away)

The second best would be to grab Uugo masteries since you cant farm stage 15 of mino yet 

3rd would be to follow your way by taking into account any advice given :P 

Uugo, save the rest.  Patience is 

key ? 0.o

I'm with Trips here. Investing in masteries - even past your starter - is a much better option than shards. Getting your core team set up properly will help you progress so much faster, generally speaking. 

I'd also hold off on using gems for energy refills until you are maxed out at the 130 energy cap. 

Is say not 130 but at least over 100 . i just reached 130 energy few days back and at 70 days played , i had to use gem for energy a few times to keep up , but under 100 , id also wait if i were to start again ! :P

I recommend that if you ever plan to use real money towards the game, at the very least keep a Daily Gem pack active. Only costs £50 or 10 US and you will al2ays have enough gems to do what you need, buy shards packs, masteries, energy.

Hmm, there are definitely cases - perhaps making sure you get a fusion like Helicath that is fundamentally going to change the way your account looks - where it can be OK. The more F2P you are, I think the more mindful you have to be of stretching your resources as far as they can go, including your gems. 

think outside few mistakes of my own , thats where the most of my gems went and was totally worth it to have hoarded them . Helicath been a blessing to my champ teams !

Also ftp.

I tend to use my gems for masteries and energy, it can be a real help to have extra energy for fusions, but sometimes you pull an amazing champ and do not want to do minotaur 

Having said that, i am going to disagree with everyone a bit here.

I have in the past used gems to buy shards.  Is it optimal? probably not. However this is a game about gambling and grinding, with a good chunk of the fun being the buzz from pulling shards. So i dont think there is anything wrong with using them this way occasionally.

I think with these type of games it is easy to sometimes focus too much on min maxing everything. Just be aware that if blowing gems on shards you may find fusions harder.

Down vote 😆 

😂

You need eenrgy to get gear and level champs. Gear will get you to NM/UNM clanboss where you get shards.

For instance since the last ancient 2x I have amassed 46 ancient shards and since the last void 2x more than 20 voids.

I'm also going to suggest that if you are an active player, the Sparring Pit has enormous value over the long-term. A fully-upgraded Sparring Pit gives 4300 XP / hour to 4* champs, and you can run five of those, for a total of 21500 XP / hour. In comparison, Brutal 12-3, which is what most people farm for XP, gives 34608 XP total (with X2 XP), divided four-ways, but only three of which go to champs that need it, so you get a total of 25956 XP, and costing 8 energy, AKA giving 3244.5 XP / energy. You get one energy per three minutes, so in an hour you get 20 energy. That means the sparring pit is giving you the equivalent of about 16 energy per hour, or, in other words, almost doubling the amount of energy you get per hour.

Of course, this is entirely dependent upon one thing - that you're active enough to log in to level up those champs in the pit. If you aren't, then the value of the pit drops precipitously.

I wouldn't necessarily level the pit to max immediately, but I'd at very least unlock all five slots ASAP.