Ethernal mode

Introduction
This solo mode is really harder than classic mode.

You need to reach round 45 to clear the level. In this mode units spawn by 1 every second up to 40 (like the classic mode) You almost have 60 secondes before next wave. The goal is to have less than 30 + x units on field where x represents a number what increases with rounds. When you exceed the figure (and after 1/2 seconde) you lose a life and another every 5 secondes. If you get 20+ units on board you can have, you'll lose 2 lifes when you reach it and 2 others every 5 secondes.

The main advantage of this mode is the speed of getting xp. You'll win it really fast (e.g. 10 mn in Lunatic to reach round 15) The problem is this is repetitive because if you don't get luck on lottery unit, you'll lose fast. On this mode, you'll rarely clear the difficulty.

The bank is difficult to increas because you always need to improve your damage.

There is no bet on round X7 and X3 nor golden cards so don't waste SP in it.

Maths
Lunatic difficulty will be the reference for examples.

In classic (4P COOP) mode you earn 39 * 8 + 140 = 312 + 140 = 452 xp in 1h30-2h

In ethernal mode you earn 14 * 8 (+1) = 112 (126 if you get xp+ with current SP) in 10 minutes. I admit that it takes 2 mn to restart a game. You can do between 7 and 10 games instead of 1, which gives between 784 (882) and 1120 (1260) xp during the same time.