|Before attacking, eat allies in the row, absorbing their Attack and Health
Monch is a high-risk, high-reward Companion that demands expendable Companions or Shades. Each time Monch triggers, they eat all other cards in the row, instantly killing those cards and giving Monch an equal amount of attack and health. A well-fed Monch is a peerless offense and defense all in one. Sacrificial Companions like Egg and Pootie are not as ideal for feeding Monch due to their low stats, and may better serve as blockers for strong attacks. If the Bell of Death is active, such Companions will likely be constantly injured as well, lowering their stats even more.
Chikichi is a fantastic pairing with Monch, as eating Chikichi or its summoned Shades has the double benefit of bringing out the next stronger incarnation while also giving Monch a significant stat boost. Once all is said and done, the end result will be the powerful Chikagoru alongside an extremely beefy Monch. A copy summoned with the Shade Wisp will not give Monch much health, but if the right enemy is copied then Monch can gain a large amount of attack. Charms with effects that trigger on kill such as the Pinch Charm and Cloudberry Charm will also trigger when Monch eats allies, making them extremely powerful.
Monch's consumption of allies does not count as attacking those allies, so on-hit effects like Teeth will not apply. Additionally, Monch does not have the Absorb ability (even though their ability does use the word "absorb"), so unlike the Woolly Drek, Monch will not gain any statuses or abilities from the consumed ally.
Above all else, make sure your Leader is not in the same row as Monch when they trigger, as Monch will kill them on the spot.