The build u need depends on what your role is in the team off course..
But a pretty common ele build in HA is a warder:
E/ :
Earth Attunement
Obsidian Flame
Earthquake
Aftershock
Ward against Foes
Ward against Melee
Glyph of Energy [elite]
Rez Sig
Earth: 16 (12+4)
Energy Storage: 13 (12+1)
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