Judar is considered ridiculously OP in canon, so no surprise he's packing some pretty damn powerful spells...most of which he can't use because they would blow the ship apart HA HA SUCKS TO BE YOU ASSHOLE. But in general, he can work with most elements and combine them, though he's not great with healing spells. He can also support anyone using magic by giving a boost to whatever element they're using.
He's also got three spells in particular that might come in handy! He can teleport something (not necessarily himself) long distance - like around a continent's worth - though this will drain him a lot. He has bullshit telepathy, which lets him broadcast images or speech into people's heads and can show them shit going down in different areas. And he has an isolation barrier, which creates a barrier around a large area that will fully nerf anything magic or supernatural within, including himself.
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He's also got three spells in particular that might come in handy! He can teleport something (not necessarily himself) long distance - like around a continent's worth - though this will drain him a lot. He has bullshit telepathy, which lets him broadcast images or speech into people's heads and can show them shit going down in different areas. And he has an isolation barrier, which creates a barrier around a large area that will fully nerf anything magic or supernatural within, including himself.