The other tough Raid Shadow Legends dungeon is Spider's Den. What makes it tough:

• Before every turn a champion takes two spiderlings arrive (to a maximum of 10). And if a champion has an ability that gives them an extra turn another two spiderlings arrive before that extra turn.
• Every other turn the big spider eats all spiderlings and heals 3% per each consumed.
• The Spider is immune to heal reduction so you can't prevent it from healing if it goes.

So the key things are that the Spider heals like crazy and all those spiderlings can do a lot of damage if you don't kill them before they go.

My team is an hp burn team:

• Ignatius (leader): leader for his defense and here for his hp burn wave to set everyone on fire.
• Venus: another hp burn aoe.
• Arbiter: for speed and team resurrection
• Scyl of the Drakes: for healing and stunning to keep the spiderlings from attacking, and she has Relentless set
• Ursala the Mourner: for defense and team resurrection

Two aoe burners and three people to keep everyone alive. Make it so that each time a spiderling goes it burns big mama. This is a 90%+ win team on level 25 and often it's down to Ursala (or maybe Arbiter) resurrecting everyone else before she dies.