I tried to do this with a friend. Both of us were level 35. We killed the 2 elf guards and the tree lots of times and never could get the named tree and Askafroa to spawn. A level 37 came by and wanted to try and we invited him. We killed the tree and the named spawn first time. We killed named but no one got any drops. We figured it may be because the 2 lvl 35s were too low, so we disbanded and let the lvl 37 do it solo. He killed the tree by himself on the next spawn and got the named to spawn again. He killed the named and friends (with our help) and he got both the hauberk and legs. The 2 lvl 35s tried about 20 more times to but we could never get the named to spawn. So either we were very very unlucky, or this is a lvl 36 or 37 drop only.