

Two or three Tos-procs inside the red circle with Rapid Fire, then Heatseekers are usually enough, curtesy of the 300% bonus damage from molten belt. Potions, evading or standing in the blue circle as well (overlap). Potions cannot be on cooldown for that, because without there's no chance to survive. As soon as that procs, into the red circle and fire everything you got.

Now it's just a question of evading his shots, evading or firing at him from the blue circle when it's active - to survive without potions, to keep the molten belt bonus damage up, and to proc ToS. Step 2: We should be roughly at +300% damage thanks to molten belt now, a value impossible to reach when wasting time evading his attacks. Don't even bother with stepping into the red circle, you'll die so often Garm will heal up fully anyway. Sadly you still get more shoots in dying and revieving rather than running around futilly trying to survive. Step 1: The first 2:45 are spend shooting him as much as possible, usually by standing still and dying after a few seconds. You can obtain either the same stat (same value or better) or other stat of random setting. If a trial level is a multiple of 3, it will be Magroth. Goes like this Magroth, Dragon, Elban, repeat. The cost of reforging is increased for each try, and is capped after the 4th. Depending on the trial it could always be Elban if you do the same level everytime. It costs a certain amount of gold (common to rare) and certain amount of gems (epic to legendary). You need about 5 minutes of time when Garm appears. You can Reforge only one stat on an item.

The Imperial Guardsmen Strategy - Die yourself to victory
