This happens to me when hosting multiplayer games and every other hydra spawn attempt fails. Mana is used, the cool down starts but the hydra either do not spawn or instantly disappear.
#Hydra does not spawn
willow topaz
ocean drum
My co-op buddy was complaining about this. He said it seemed to happen mostly when he spawned hydras on top of enemies, but could happen anytime. He'd spawn them and they'd instantly dissapear leaving a tiny firy shadow circle on the ground where they should be.
He was playing with 4 people, and there was another wizard on the team. He hasn't played wizard since so unsure if those had anything to do with it
zinc kiln
Can confirm this still happens. Solo, multiplayer, doesn't seem to matter. Sometimes nothing spawns, sometimes all, sometimes 1 or 2
teal jasper
+1
ocean seal
It does have a bit of cast time, so unless you have some extra cast speed, you'll actually need to stand still for a brief moment to spawn it. You can't just click it while spam dashing, or constantly firing off other spells and expect to reliantly summon it.
formal jacinth
It seems to also not spawn near walls or allies if you are near them.
zinc kiln
It does have a bit of cast time, so unless you have some extra cast speed, you'l...
i've been completely still and had it not spawn 3 times in a row
shy thorn
still happening, maybe 10% success rate, most of the time it despawns after trying to spawn and sometimes it gives 1-5 hydra heads
vital elm
+1
mighty yew