Trendy Entertainment are feeling a bit celebratory right now, and for good reason – they’ve reached 1 million+ users for their mobile online RPG Dungeon Defenders and are looking forward to adding many more with the release of a console version. In order to celebrate, they’re giving out the second expansion – Second Wave – free to all Android users. It’s normally $10, we hear, so this is a great deal if you’ve been waiting for one. Find the free download here.