Protect the King

The second mode you will unlock is called Protect the King. This mode unlocks once you have 100 trophies. The goal of this mode is to survive as many waves as possible keeping the King alive. Monsters will spawn in waves coming across each bridge outside the base. As you kill monsters coins will drop that are shared between both players so it doesn't matter who picks them up. These coins can be spent to level up your Hunter, heal your Hunter, or increase the drop rate of gold. The cost of healing your Hunter increases by 5 gold each time you use it up until you spend 20 gold to heal. It will then cost 20 gold per heal and continues to scale the more times you use it. If you die you will respawn as long as your partner and the King are still alive.

Strategy

This isn't a very popular mode to play. The games can be long and the rewards aren't great. Though, if you have the right Hunter or partner this can be left to run through waves as you AFK. You may struggle when you first start this game mode but as you get better Hunters a good strategy is to take the gold boost at the start of the game 5 or 6 times so you get the most use out of it throughout the game. Then just continue to level up your Hunter as you are able.

Good Hunters to use in this mode are Hunters that can control the crowd of monsters or have Death Strike as the monster health will scale up over time. Hunters with Multishot and Death Strike are good choices. If you are playing with a friend it is good to coordinate to have one person pick a crowd control Hunter while the other picks a Death Strike Hunter.