I explain how to earn true heart of wood in 1 hour: have decent character solo Devil assault of Epic Normal, then before finishing last boss (he can be kited for long time, hint) put LFM with following: Free mats and goodies from chests, at end fight (pass me tokens please). Usual drop is 2 tokens per run (sometimes u get 1 token), takes around 35 min to solo it, need ship rebuff each run so need around 70-80 mins for 2 runs, you get around 10 tokens per run (with other 5 people also passing you).
Another option if server is slow to fill group for free chests in DA EN, you can do Time is money run. You need level 21 though for challenge so join usually run EN VON 3 runs, need around 3 of them (1 hour from 20 to 21). When you got 21, go for Time is money, choose difficulty for lvl 25, go solo. Do run few times and you will know how to get around 150-170 epic mephit wins in 5 min. 1 Token is 300 epic wings, so you get around 5-6 tokens per hour.
This info is for developers, how to farm easy at lvl 20 (21) tokens for true heart of wood.