Upon reaching level 34/35 you might ask yourself: "what next?"
Here's a few ideas:
These raids are unlocked for characters above level 34. To start one, you will need an item that you obtain via a daily repeatable at an NPC near the raid entrance (for Contaminated Garden, the quest is available at the lake nearby). You may do this quest only once per day and you will receive 3 items, allowing you to access the dungeon 3 times (note: one time means one instance, not entering 3 times, you can still use the leave/reenter trick for catacomb)