Subject
Leveling 3, 4 and 5 star heroes (Analysis, Advice)
==Beginning Advice==
Team heroes are heroes you use for the map (world energy), raiding, or titans (alliance energy).
Once you have access to 2* heroes, from Low cost recruit training (recruit training level 4 or RT4), heroes that are 1* are not worth leveling.
Once you have access to 3* Heroes, from Elite recruit training (RT13), or a full 3* team from Epic summon tokens, heroes that are 2* are not worth leveling.
==Simple Advice==
To level your team’s 4* heroes, level them with heroes of the SAME color that are 1* or 2*.
To level your team’s 5* heroes, level them with heroes of the SAME color that are 1*.
To level your team’s 3* heroes you can use any hero of the SAME color, including Trainer Heroes (v1.8), but regular 1* and regular 2* are the best.
Use duplicate heroes to level the same hero on your teams. Example: use Graymane to level
==Complex Advice==
To level your team’s heroes with 8/8 special skill (they have maximum special skill), level them with any hero of the SAME color, including Trainer Heroes (v1.8), but heroes from low cost recruit training, or extra low cost recruit training, are the cheapest for food and recruits.
To level your team’s 4* and 5* heroes that have reached Tier 3 of 4 (ascended twice) or 6/8 special skill, use any hero of the SAME color, including Trainer Heroes (v1.8), but regular 1* and regular 2* are the best.
==Data behind conclusions==
==Leveling time and costs (food, recruits)==
Using heroes of the SAME color that are 1* or 2* from extra low cost recruit training (recruit training level 11 or RT11) gives your team 2160+ XP per day per training camp. High XP per day per training camp is good. It costs 5.6k, or less, in food for +1000 XP. It costs 11.1 recruits, or less, in recruits for +1000 XP. Low food, and recruits, per +1000 XP is good.
==Skill Roll Math==
Each hero tier has a max level. Example: a 4* Hero, Tier 1 has a maximum level of 40. Until you get the ascension materials for the next tier, you cannot continue to level your 4* or 5* hero. Because of this you want the highest +% skill roll per 1000 XP.
Training with a 4* hero of the same color gives you 1080 XP and +8% skill roll.
Training with six 1* heroes of the same color gives you 180 XP x6= 1080 XP and +12% skill roll.
Random Number Generator (RNG) can still mess you up, but 1* heroes of the same color will raise your special skill much faster so you can enjoy 8/8 special skill much longer. 1* heroes will also give you a higher special skill while waiting to get ascension materials for the next tier of 4* and 5* heroes.
This is less important for 3* heroes since their ascension materials are easier to get. But 1* heroes are still best for skill rolls.
Note: The exception are duplicate heroes. Leveling a hero with a duplicate of itself gives you a +25% skill roll per duplicate. So four duplicate heroes give you a 100% chance of the special skill increasing.
==Skill Roll Complex Math==
Using heroes of the SAME color that are 1* or 2* gives your 4* or 5* hero +8.54% skill roll / 1000 XP, or higher. If you level your team’s heroes using heroes of a different color that are 4* you only get +4.44% skill roll / 1000 XP meaning your special skill will be 52% as high as using same color and 1* or 2* for leveling your team’s heroes (this is a simplification for comparison purposes).
==Recruit Training costs, XP gain and skill roll gain==
==Extra low cost recruit training==
Using extra low cost training camp (RT11)
2 recruits, 1k food, 12 per day
1* other color =
150 XP ( 6.7k food / 1k XP, 13.3 recruits / 1k XP )
+1% skill roll ( +6.66% skill roll / 1k XP )
1800 XP / day for team
1* same color =
180 XP ( 5.6k food / 1k XP, 11.1 recruits / 1k XP )
+2% skill roll ( +11.11% skill roll / 1k XP )
2160 XP / day for team
2* other color=
390 XP ( 2.6k food / 1k XP, 5.12 recruits / 1k XP)
+2% skill roll ( +5.12% skill roll / 1k XP )
1800+ XP / day for team (ratio to 1* heroes is unknown)
2* same color=
468 XP ( 2.1k food / 1k XP, 4.27 recruits / 1k XP)
+4% skill roll ( +8.54% skill roll / 1k XP )
2160+ XP / day for team (ratio to 1* heroes is unknown)
==Guaranteed rare recruit training==
Using guaranteed rare training camp (RT12)
45 recruits, 164k food, 0.5 per day
3* other color=
630 XP ( 260k food / 1k XP, 71 recruits / 1k XP)
+3% skill roll ( +4.76% skill roll / 1k XP )
315 XP / day for team
3* same color=
756 XP ( 216k food / 1k XP, 59 recruits / 1k XP )
+6% skill roll ( +7.93% skill roll / 1k XP )
378 XP / day for team
==Elite recruit training==
Using elite training camp (RT13)
70 recruits, 265k food, 0.5 per day
4* other color=
900 XP ( 294k food / 1k XP, 77.77 recruits / 1k XP )
+4% skill roll ( +4.44% skill roll / 1k XP )
315+ XP / day for team (ratio to 3* heroes is unknown)
4* same color=
1080 XP ( 245k food / 1k XP, 64.81 recruits / 1k XP )
+8% skill roll ( +7.40% skill roll / 1k XP )
378+ XP / day for team (ratio to 3* heroes is unknown)