Mini Boss every 3rd level
Show a unit DPS list like Underlord's to the right side of the screen
About 20-30 passive items that can be collected every 3 levels
Lv.3 effects for every character

Boss ideas
  Pretends to be dead, grants speed buffs to enemies after death, especially if the round has gone on for too long which means the player is surviving with 1 unit

Classes and characters
  Trapper: releases +1 trap
    Plague Doctor [trapper, nuker]: releases an area that deals 6 AoE DoT
    Fisherman [trapper, warrior]: throws a net that entangles enemies and prevents them from moving
  
  Lich [mage, enchanter]: nearby enemies have decreased movement speed

Items
  Resonance: hitting walls has a chance of releasing projectiles
  Ouroboros Technique: rotating around yourself makes every unit release projectiles
  AoE 1: all units that deal AoE damage have increased stat
  AoE 2: increased stat if all your units that deal damage deal AoE damage
  Proj 1: all units that release projectiles have increased stat
  Proj 2: increased stat if all your units that deal damage release projectiles
  Wallrider: hitting walls grants a speed buff for a small duration

Enemy modifiers
  Grant nearby enemies a speed boost on death
  Grant nearby enemies a damage boost on death
  Explode into projectiles on death
  Charge up and headbutt towards the player at increased speed and damage
  Immune to knockback

UI
  Highlight units of a class when hovering over the class icon in the "sets" section
  Add stat details to each unit when hovering over it in the "party" section

Balance
  More damage to AoE units with big cooldowns
  Warriors that deal AoE damage should deal extra damage based on number of enemies hit

Bugs
  Squire and Chronomancer don't affect leader
  Sage's pull force doesn't increase with unit level
  Cleric's healing amount doesn't increase with unit level
  Squire and Chronomancer's buffs don't increase with unit level