Quote Originally Posted by Myyrn View Post
That's really great warlock overhaul. I want to try it soon. Is it possible to add some features of base warlock like Dark One's Own Luck or Misty Escape? Without such abilities class seems focused on damage too much.
Thanks!

The core class is pretty combat-focused, yes. Non-combat features are intended to come from invocations - while it's possible to choose only combat-related invocations, there are also more than enough utility invocations to choose from.

Quote Originally Posted by Myyrn View Post
Book of Eldritch Secrets allows to cast spells. Must warlock always cast these spells at lowest level or she can cast them at any level reserving eldritch dice respectively?
My intention is that you can upcast the spells if you want to. Of course, that's more expensive, so...

Quote Originally Posted by Myyrn View Post
Is not it too weak for 14th level? +1d8 to eldritch blast for same amount of health.
Eh, maybe? But remember that Eldritch Blast isn't the only thing you can spend your dice on. You could use it on Burn Through Power to reroll your EB damage if you had a bad roll but didn't save any dice, for example. You can use it for Arcane Armor or Arcane Evasion if you don't have any dice left over, potentially avoiding way more than 1d8 damage. You can use it for invocation features - Drawn by Death, say, or with Book of Eldritch Secrets to let you upcast a little without losing more Eldritch Dice until a rest.

Quote Originally Posted by Myyrn View Post
Does it mean warlock can use any amount of eldritch features and regain 1 expended die? Or warlock have to use only 1 feature and expend only 1 die on it?[/spoiler]
The Fiend's 18th level capstone feature gives you back 1 Eldritch Die at the end of a turn that you've spent only 1 Eldritch Die. If you use Arcane Armor, say, the feature gives you your die back. If you spend multiple dice - say, on Eldritch Blast - you don't get anything back from Master of Power.

Eldritch Master, on the other hand (the 20th level capstone feature for the whole class) gives you 1 die back whenever you spend more than one die on a feature. If you use Arcane Armor, you don't get that die back, but if you use Eldritch Blast with multiple dice, then you do get one die back. If you're a Fiend who has both, you're going to be getting 1 die back every turn that you spend any amount of dice.
It should be noted that Eldritch Master and Master of Power don't interact with Eldritch Reactions. Eldritch Reactions is a way to spend Eldritch Dice, but it is not an Eldritch Feature and thus does not trigger Eldritch Master or Master of Power.