Infernal Tyrant 3 is the 3rd stage of Reign of the Tyrant. Previous stage: Infernal Tyrant 2. Next stage: Infernal Tyrant Climax.
The Aku Altar base makes this markedly harder — clearing the Aku Realms first is strongly recommended before attempting it.
- The core plan is unchanged: stack Crazed Lizard Cat in Nyandam's blind spot and never let him advance.
- Elder Sloth adds an irritating backliner that the previous two stages did not have.
- You need units dedicated to the support on top of the ones holding the boss.
4.67M HP Aku boss and the hardest hitter in the Advent set. Its first Multi-Hit lands 666,666 damage at -400~400 Omni Strike; the 2nd and 3rd hits reach 500~800 and 1,000~1,250 and are Toxic, stripping 30% of a Cat Unit's maximum health each. Immune to Knockback, Weaken and Surge.
⚙ More counters worked out from the roster, lower confidence than the picks above; kept for reference
Infernal Tyrant Nyandam is Aku. Anti-Aku units take less damage and deal more.
MASTER URIL A Esoteric Uril: Strong against Relic, Aku (Deals 1.5x damage, only takes 1/2 damage) Also fits “Out-range Infernal Tyrant Nyandam.” 
BARREL CAT B Barrel Cat: Resistant to Aku enemies Also fits “Clear the crowd.” 
BRAINWASHED COW CAT A Curses Aku enemies, shutting off their abilities. 
HEAVENLY GOD SUPER ZEUS S Slows and resists Aku enemies. Also fits “Out-range Infernal Tyrant Nyandam.” 
CAT CACTUS B Cat Cactus: Strong against Aku enemies (Deals 1.5x damage, only takes 1/2 damage) Infernal Tyrant Nyandam reaches 400 range. Units that out-range it can chip safely without taking hits.
MASTER URIL A Range 405 — fires from beyond its 400. Also fits “Counter Aku.” 
ADULT CAT B Range 475 — fires from beyond its 400. 
NERD CAT A Range 1200 — fires from beyond its 400. Also fits “Clear the crowd.” 
MIGHTY REKON KORPS S Range 470 — fires from beyond its 400. Also fits “Burst the boss down.” 
URURUN WOLF A Range 450 — fires from beyond its 400. Also fits “Clear the crowd.” Infernal Tyrant Nyandam has a deep HP pool (4,666,666+ even before stage magnification). Heavy single-target burst shortens the fight.
BAHAMUT CAT S Huge multi-hit burst — a story-unlock powerhouse that deletes tanky enemies. MIGHTY REKON KORPS S Among the highest single-hit Area damage available. Also fits “Out-range Infernal Tyrant Nyandam.” 
GAIA THE CREATOR S Long-Distance multi-hit with Insane Damage — a generalist wall-cracker. 
CRAZED MONEKO A Big crit burst against tanky/Metal targets. 
CHILD OF DESTINY PHONO S Big Multi-Hit Massive-Damage bursts from safety. Also fits “Out-range Infernal Tyrant Nyandam.” 6 enemy types stack up here. Area attackers hit the whole push at once instead of one unit at a time.
MASTER URIL A Area attacks hit everything in range. Also fits “Counter Aku.” BARREL CAT B Area attacks hit everything in range. Also fits “Counter Aku.” NERD CAT A Evolved/True hit groups over a Long Distance band. Also fits “Out-range Infernal Tyrant Nyandam.” MIGHTY REKON KORPS S Long-range (Omni Strike in True) Area clears groups front and back. Also fits “Out-range Infernal Tyrant Nyandam.” URURUN WOLF A Area attacks hit everything in range. Also fits “Out-range Infernal Tyrant Nyandam.” 
The castle you destroy to clear the stage.