While reading the skill, it seems like it should absorb both types of damage.
1 Answer
Sion's shield (like most other damage shields: Shen's, Janna's) absorb damage from any source.
Only Morganna's black shield specifies a damage type (in this case, magical).
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As Michael Hopkins notes, Morgana's black shield blocks magic damage, not physical damage. Commented Nov 4, 2010 at 16:57
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Also important to note that Morgana's shield blocks magical effects, the most common being crowd control. No regular shields like Sion's do this. Commented Sep 15, 2012 at 1:25
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Morgana's shield is basically a spell shield like Banshee's Veil combined with the magic-damage-only shield from Hexdrinker/Maw of Malmortius Commented Jan 25, 2013 at 21:01