Brave Frontier - Holy Battery Niko 6*

My submission for the Brave Frontier Unit Art Contest
Unit Name : Holly Battery Niko
Type : Earth
Lore : A mortar specialist otherwise known to be related to Douglas. He was an expert at stealth missions, but soon grew tired of them and decided to confront hordes of enemies at the same time, even if his weapons was not made for such encounters. This greed led to him growing stronger, but later had him on his last legs as he took on too many powerful enemies at once. It is said that he made it out alive, but he seemed to have disappeared to somewhere unknown.
Evolution Rarity : 3* to 6*
Leader Skill : Decimator Batteries - Small chance of applying Weakness, Injury, or Poison when attacking and huge boost in critical hit damage
Brave Burst : Assault and Battery - 21 combo Massive Earth Attack on Single Enemy & Probable Weakness, Injury, and Poison effect and applies stealth to self for 1 turn.
Super Brave Burst : Final Bombardment - 55 combo Massive Earth Attack on Single Enemy & High chance of Weakness, Injury, and Poison effect and applies Stealth to self for 1 turn. Activates "Ack, I'm out of energy!" the next turn before attacking
"Ack, I'm out of energy!" - Applies a Non-Removable 80% Atk Debuff for 3 turns
Base 6* Stats
HP: 4,475
ATK: 1,900
DEF: 950
REC: 925
I changed his stats around a bit, and his BB and SBB a bit from what's on the paper