Added new events that can drop Tech. Added Xeno Tutorial to help learn about game mechanics and more. Tech rewards can now be refreshed with Metal. Adjusted Healing/Swift/Shield devices: their buffs no longer stack up. Fixed the glitch of item lost. Fixed the glitch in Airdrop Mines. Fixed the glitch in Smoke Grenades & Decoy Devices. Fixed the glitch of game crash when launching grenades. Fixed the missing texts. Fixed the glitch of Beam Tower.