Do you have the Titans ?
If so place a relic, use the change name effect and change the name of the relic (i.e. Spirit of Nidhogg).
Next make another trigger (active) with the unit is garrisoned in condition and instead of unit you write temple.
Next, the effect must be grant godpower (nidhogg to player 1) and invoke godpower (the nidhogg godpower you just got).
And there you have it ! Your one relic summoned Nidhogg.
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Ambition DesignsRule # 1: If you want something done properly, kill Baldrick before you start it !
-Edmund Blackadder