The Sigils of Hope node, Waves of Light, which is supposed to chain the Divine Flare spell, doesn’t appear to do anything. With a few ranks of it, casting a new sigil, while i’m at my cap, does proc a Divine Flare, but even in a group of enemies, it only goes off one time, and no chaining as far as i can tell.
Additionally, if the tooltip is accurate, each rank increases the mana cost of each chain, on top of adding a new total to the number of possible chains. This seems like it may be an oversight; at max rank, it would cost 150 mana to chain the 5 times, which seems expensive when compared to lava bursting shield throws, a relatively similar mechanic.